Photos of the different issues will help greatly. Preform screenshots of the Flexible parts and photos of the Grey parts with unwanted geometries.
Sounds like you have failures due to cupping and your didn’t filter the resin before starting the next prints, which may have lead to the parts not printing correctly.
The stray bits of cured resin attached to your grey parts may also have been due to the resin being contaminated.
Before opening the printer I’d print this and post a photo of the results :
The corner columns in particular are an excellent indicator of contamination on the path of the laser.