Well it's about a month and a half after I started pairing.

For the first month it went very well. I would introduce the male into the female's enclosure (1 male to 3 females), and I would witness a lock within a few hours every time, move him on to the next, etc. He would lock with all three within 3 days, stay locked for about a day. They would stay cuddled together after a pairing, and there would be urates where their tails were, but it wasn't a huge mess. After 2 to 3 days he gets 3 days off. Worked very well.

Then, started a couple weeks ago (last two pairings with each female), this is what happened.

1) He is still pairing fine and normally with female #1.
2) I have introduced him and left him for two days with female #2, and not witnessed any lock. They were resting at opposite ends separately in the tub.
3) With female #3, this is what is worrying me the most. For two times in a row, I did not witness any locks. Not only that, within 10 hours after pairing, I check, and it is both times a big mess. Urates covering the snakes completely so they look "ghostlike". Urates all over the tub, including walls, the entire bottom floor and even on the roof. The first time the water bowl overturned too. I don't even know if I should leave him in there or wash them or what.

Anyone have any idea what is going on as they were all locking properly until two weeks ago.