It's happened to me a few times. There were different factors that caused it for me: support placement/density, positioning of the printed part, and the weight of the part. What resin(s) is the problem happening with?
Increase the base layer exposure time, if that doesn't work add more base layers. Assuming it's an open system with material configs stored as plaintext, anyhow- I'm not familiar with Nextdent stuff.
Glad to hear that you figured out the problem! I actually wipe down the build plate with clean alcohol before every print run (in addition to washing it after removing printed parts),and that seems to work for me. Hopefully, the problem won't recur!