There is a button to reload selected shape.

TDB looks fine: TrSignalType ( 00000000 0 4.2651339 T_Small_WB ) TrSignalType ( 00000000 1 1.123541 T_Small_WB ) As you can see, after flip, the second value changed from 0 to 1 indicating other direction and signal direction in radians was modified by 3.14 radians - 180 deg. Try some hacks on these...

TSRE renders dyntracks like a static S file shape. Such crazy rotations wont work. But it has nothing to do with the topic.

Maybe it's a RTS bug? There is something like minimum distance from junctions in MSTS ..
Check if TDB entry for this signal changes if you flip it.

What happens if you flip it and it is facing other direction in TSRE? Does it faces different direction in RTS?

If angle is positive, start from the other side. I don't know if that helps with anything, but you can try and check.

MSTS, OR, TSRE and RTS don't use TDB for making these shapes but data from the W file. Sadly I don't see any pattern in your examples. You can experiment with it more, but I don't know if you can do anything about it if no one is working on RTS anymore. Try using negative angles for dyntracks instea...

It is how it works. Only loose consists are stored inside an activity file.
Player and AI consists are stored inside separate CON files. These files can be shared between multiple activities, so the best way to edit them is to make new consists and edit activity using TSRE route editor.

I have no idea why it can be wrong.

Check write permissions for these files, try enabling terrain QT in settings.txt