In 2022 I got my work permit from the Nonthaburi Immigration Office. I went back in 2023 and they said the stamps are wrong and I have to pay a 11,000 baht overstay fine (even though I was doing 90 days on time and had a valid work permit + a stamp from the Thai embassy in Laos + airport stamps).
I thought it was kind of odd that she pushed aside the school documents and immediately started to flick though my passport port. Stamp by stamp since the first page. It was like she knew something.
The nasty truth: The teacher agencies pay money under the table (this is the same office that issued the work permit). Wait a year and then purposefully find those stamps and fine you.
I have a degree and a work permit and I still get punished.