FEP film

Hello, So I’m still new to some things and trying to figure some things out along the way, I just finished a print and I noticed some resin had cured on top of the lcd screen and noticed it came from the screws that seemed to have loosened during printing, is this normal? I haven’t had any leak before now and it didn’t reach the edge of the lcd glass.

Also I checked my film and noticed a few deep marks is this a sign I should change the film? It’s done around 16,000 layers