Because how many numbers?

Questions
1

Because that when a tile is rotated with tiled are entered multiple numbers as gid instead of the original tile gid? Example:
<tile gid="2684354561"/>

2

You have used the FLIPPED_HORIZONTALLY_FLAG (0x80000000) and FLIPPED_DIAGONALLY_FLAG (0x20000000)
Those flags are stored with the gid(in your case, 1), that’s why you can’t see the gid, you need to extract those flags first.
For more information, see Tile flipping

3

I use Z shortcut, I read the link that you indicated more I still I could understand