Reputation reset (and keeps resetting)

That’s because there are multiple issues regarding reputations. Your issue is unrelated to ours.

Reputation no longer boosted in MoP: Remix after pre-patch - Support / Customer Support - World of Warcraft Forums - https://eu.forums.blizzard.com/en/wow/t/reputation-no-longer-boosted-in-mop-remix-after-pre-patch/524906/96

Remix had another set of issues, and some fixes were applied. However, it is still not working as it did prior to pre-patch. So, check the thread and see if you can find any valuable information there.