F-Droid issues

Is something screwed up with the repo or build process or is it just me? I sometimes get a “failed to verify APK” error message when I try to update to the latest nightly with F-Droid. Here’s a screenshot:

I used to get that constantly, to the point that I just got tired of dealing with it and now use adb install -r from my laptop instead. The only time it would work for me is if I had just installed or updated fdroid.

It’s broken again. Same message as before, but refreshing the repo no longer solves the problem.