Why is this case activating when it's not suppose to?

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C#

Hi, i am extremely confused on this issue. below is my code, there are two switch statements that activate depending on the set tags for buttons. However when pressing a button that has the tags of "white" and "pawn", the case for "black" and "pawn" will also activate on top of the intended case for some unknown reason. But when pressing the black pawn button the reverse does not occur. Am i missing something?



For context: Chess game. 64 buttons in chess grid, counting left to right, bottom to top e.g) bottom left corner is Block1, Bottom right is Block8, Top Left Block 57. IsEnable is set to false to indicate to me where pieces can go at the moment. when pressing a white pawn the tile above and below both become disabled. when pressing black pawn only the below tile becomes disabled

What I have tried:

private enum ChessPiece
        {
            Pawn = 1,
            Rook = 2,
            Knight = 3,
            Bishop = 4,
            Queen = 5,
            King = 6,
            Black = 16,
            White = 0,
        }

        public void Setpieces()
        {
            Block16.Tag = ChessPiece.White | ChessPiece.Pawn;
            Block15.Tag = ChessPiece.White | ChessPiece.Pawn;
            Block14.Tag = ChessPiece.White | ChessPiece.Pawn;
            Block13.Tag = ChessPiece.White | ChessPiece.Pawn;
            Block12.Tag = ChessPiece.White | ChessPiece.Pawn;
            Block11.Tag = ChessPiece.White | ChessPiece.Pawn;
            Block10.Tag = ChessPiece.White | ChessPiece.Pawn;
            Block9.Tag = ChessPiece.White | ChessPiece.Pawn;

            Block1.Tag = ChessPiece.White | ChessPiece.Rook;
            Block2.Tag = ChessPiece.White | ChessPiece.Knight;
            Block3.Tag = ChessPiece.White | ChessPiece.Bishop;
            Block4.Tag = ChessPiece.White | ChessPiece.Queen;
            Block5.Tag = ChessPiece.White | ChessPiece.King;
            Block6.Tag = ChessPiece.White | ChessPiece.Bishop;
            Block7.Tag = ChessPiece.White | ChessPiece.Knight;
            Block8.Tag = ChessPiece.White | ChessPiece.Rook;

            Block49.Tag = ChessPiece.Black | ChessPiece.Pawn;
            Block50.Tag = ChessPiece.Black | ChessPiece.Pawn;
            Block51.Tag = ChessPiece.Black | ChessPiece.Pawn;
            Block52.Tag = ChessPiece.Black | ChessPiece.Pawn;
            Block53.Tag = ChessPiece.Black | ChessPiece.Pawn;
            Block54.Tag = ChessPiece.Black | ChessPiece.Pawn;
            Block55.Tag = ChessPiece.Black | ChessPiece.Pawn;
            Block56.Tag = ChessPiece.Black | ChessPiece.Pawn;

            Block57.Tag = ChessPiece.Black | ChessPiece.Rook;
            Block58.Tag = ChessPiece.Black | ChessPiece.Knight;
            Block59.Tag = ChessPiece.Black | ChessPiece.Bishop;
            Block60.Tag = ChessPiece.Black | ChessPiece.Queen;
            Block61.Tag = ChessPiece.Black | ChessPiece.King;
            Block62.Tag = ChessPiece.Black | ChessPiece.Bishop;
            Block63.Tag = ChessPiece.Black | ChessPiece.Knight;
            Block64.Tag = ChessPiece.Black | ChessPiece.Rook;

        }


        private void ChessBlock_clicked(object sender, RoutedEventArgs e)
        {
            List<Button> buttons = new List<Button>
            {
                    Block1, Block2, Block3, Block4, Block5, Block6, Block7, Block8, Block9, Block10,
                    Block11, Block12, Block13, Block14, Block15, Block16, Block17, Block18, Block19, Block20,
                    Block21, Block22, Block23, Block24, Block25, Block26, Block27, Block28, Block29, Block30,
                    Block31, Block32, Block33, Block34, Block35, Block36, Block37, Block38, Block39, Block40,
                    Block41, Block42, Block43, Block44, Block45, Block46, Block47, Block48, Block49, Block50,
                    Block51, Block52, Block53, Block54, Block55, Block56, Block57, Block58, Block59, Block60,
                    Block61, Block62, Block63, Block64
            };

            if (sender is Button btn)
            {

                ChessPiece piece = (ChessPiece)btn.Tag;

                switch (piece & ~ChessPiece.White)
                {
                    case ChessPiece.Pawn:
                        textBox3.Text = "W pawn";
                        int index = buttons.IndexOf(btn);
                        Button destination = buttons[(index + 8) % buttons.Count];
                        destination.Tag += "active";
                        destination.IsEnabled = false;
                        break;

                    // cases for other white pieces
                }

                switch (piece & ~ChessPiece.Black)
                {
                    case ChessPiece.Pawn:
                        textBox3.Text = "B Pawn";
                        int index = buttons.IndexOf(btn);
                        Button destination = buttons[(index - 8) % buttons.Count];
                        destination.Tag += "active";
                        destination.IsEnabled = false;

                        break;

                    // cases for other black pieces
                }
            }

        }