here's what i did:
1. create a map with one difficulty and submit it
2. create another difficulty or multiple difficulties and submit it/them to the same set
3. BSS created two separate sets, one with the original difficulty and one with the original difficulty + the new diffs.
the original diff is also stuck as if it's not the latest version no matter how many times i update it. updates also seem to only go to the second newly created set.