I’m titally new at this but I don’t think it’s the infill since it’s just one side and not all over that side.

I also noticed when wet sanding it filament lines broke of like splinters, like the didn’t melt in to the model as they should. Does that indicate too low temperature? What’s ideal? I’ve read 205 degrees at some places and I’m just 5 degrees below that. Does that make that big of a difference?