I'm not sure if we're allowed to de-anonymise our groups, so no exact group IDs and items. However, I've got to say that a unique item of our group (so, couldn't be a swap of "my orange for Bob's orange") has come back to me - not that I mind, but the theory is "I'll make sure you don't get back your own contributions", which means the algorithm is not correct.

I received 3/5 of my own gifts from yesterday that weren't a double in the prize pool as well.

Same here. Got 2 of my 5 gifts back. :/

I think I got my items back too. I say think, because when I go to the MM page I can't scroll down to see what was given out but I only see a handful of "new" items in my inventory and some that I had given out. Worked fine the past couple days.