It seems to be possible that the summary size on a repo (top right) can become out of sync with git-annex files. In this example, this one file is larger (6.6MB) than the repo thinks its entire size (3.3MB) is:

The number seems to be generated -- and then cached -- by this function:

https://github.com/neuropoly/gitea/blob/fa43bce541507c8a702723f84764a48db9278506/modules/repository/create.go#L288-L301

So this is a cache invalidation problem: git annex copy --to is not triggering a recomputation like it should be.