would someone explain to me why event chars are replaced with random sprites?

[DERIDEX120]

I havent been changing any sprites around, and i've not been modding any of the events (the ones that require coding)
I have, however, been playing around with the patcher. Primarily damage values and formulas, but I also changed up the bard job class.

When I test run the game though, ive found at some point the story characters are replaced with random sprites from within the event. the 2nd battle, delita appears as a female squire every time. the battle in sweegy woods, algus and delita both appear as goblins. the battle after that, algus and delita both take on the sprite of the character who interrogated that knight. (I can't recall details on that one.)  however the ENTD is exactly as it should be for those events.

I've also noticed the text editor isn't working anymore. the progress form says 0 bytes left on DTE and a message states the ISO has NOT been modified.

Do I need to get a fresh ISO and start from scratch here?