This is not a bug, it's just something that is possible to do because of the detailed hero rankings. If they decide to change it, it's possible to just make the xp invisible and only show hero levels. It would be an easy fix and I would be able to manage without that extra detail.
With that being said let's leave this to the developing team unless we have some constructive feedback or opinions that matter for this thread and stop spamming.
(Off topic: EG is getting close on com7 so let's get rocking, good luck to both sides