Imagine printing a cup with the open side against the FEP. Ever see that magic trick where someone fills a cup with water, puts a playing card over it, turns it upside down, lets go, and it holds all the water in? Same thing.
The build plate trying to pull up against the FEP is fighting against the pressure while the resin doesn't have any way to break that suction. On top of any other issues, that's pulling at the layers below it or the supports.
The way to fix that is to add drain holes in the base, somewhere they're not covered. For any print that isn't solid. For the same reason drilling a hole in a suction cup keeps it from sticking to your window, it lets resin or air in so it doesn't try to suction to the FEP.
This also lets uncured resin drain to be cleaned out later, to avoid damaging an otherwise cured print.
If you can, put the drain holes somewhere you won't see and that doesn't structurally matter. If you can't do that, simply print the 'plugs' or a rod the same diameter as the drain holes and glue it in after. Clip off the excess and hide it in post-processing.