Hi,
I released 3.1.16 which was rather a quick fix of a major issue we had since first version of huggle 3. The problem is briefly described in commit message https://github.com/huggle/huggle3-qt-lx/commit/2d5b5b23dab223d4c0f36029823d6...
Basically this issue caused huggle to randomly (rarely) corrupt some incoming data, which doesn't matter so much on wikis where rollback is being used, because on these it's mediawiki which actually performs the revert. This was however affecting other wikis where rollback is available to admins only.
It's strongly recommended to upgrade to new version, especially if you are using huggle outside of english wikipedia.