I have no idea yet how it works or wether it's an actual issue, but there seems to be the pattern, that the old stable version and the unstable version seem to be equal, while the new stable version is newer. Hints towards a bug.

Edit by @fricklerhandwerk:

We want to display when the evaluation for a matched derivation was made, so users can inspect whether the data is recent. Needs refinement on how to present that.