Modding issue when swapping object FIDs

Hi ! I'm working on a script that modifies the game files.
I've run into the following problem (shown in the video), where at first swapped sprites look correct, but then after some time get shifted.
I've tried modifying both .map and .pro files, matching FID, ScriptID, SX, SY values...
Maybe someone could give me a clue?

Check the offset values in the original overseer seat FRM?

If this is with the ettu mod, it's possible that Master frames were adjusted, since it would sometimes misalign the Master. Can't remember the details anymore, it's been too many years.

Thanks!

NovaRain said:

Check the offset values in the original overseer seat FRM?

Click to expand...

But wouldn't it then return back to initial position at some point?

Lexx said:

If this is with the ettu mod, it's possible that Master frames were adjusted, since it would sometimes misalign the Master. Can't remember the details anymore, it's been too many years.

Click to expand...

Yes, its et tu mod.