They do this regularly, do not trust them, I have tolerated these "delays" for about 4 years. They ended up not paying for 4 months and have only paid because I complained here (that is why they probably paid you as well, because couldn't silently steal you). If you are a smaller affiliate like me they will Levente scam you, and I also think they untag players and they still haven't migrated the old payers (in 3 years!!!!) at the time I stopped working with them (I doubt they have migrated them since or will ever, which means years of work lost).
Just cut your losses while you can they should not be trusted. They know they accept UK+US traffic (illegally btw...., there is no licence that would make you be able to accept US + UK players legally and credit cards...) so affiliate partners who don't mind shady, illegal behaviour will flock to them because there are less and less shady programs like them, which accept UK + US traffic, they abuse this.
My experience:
I was a member of Genesys affiliates for 4-5 years, at certain points I used to make $ 2-3000 per month there, and at that time they were my biggest affiliate partner. Luckily, lately this has dropped, and I'm no longer reliant on them (an others have went up). So I can finally drop them. For...
www.affiliateguarddog.com
Contrary to the "resolved" status, it is not, migration not yet done, have stolen for years prior to it, I have no idea why someone put that in "resolved", only their last theft attempt was resolved because I complained.
They will keep on doing this, and if you area small affiliate partner they will not stop paying you eventually. I recommend switching to a more legal, more trustworthy program, you will make less but they are more reliable, less prone to scamming you.