So I had another rat litter a few days ago and sure enough I went to check on them the next day and they were all gone! This is the third time in 2 weeks that I had a litter completely eaten! My current setups are as follows....

1.1 in 1 tub. she had a litter I think, she was big then a few days later she was normal size again but no babies I could see.

1.2 in another tub. had my first litter from one of the females but the female from tub #1 ate them thats why I moved her to a tub by herself. I got another litter a few days ago but i'm not sure if it was the same female as before. The other female is preg now.

The way I have been doing it is just leaving them all be, not removing the males. Should I try removing the males and see if that makes a difference? I don't think the males are the ones eating the babies and the mothers are nursing (I think, they all had nice fat white bellies). They are in 70qt tubs with plenty of food and water and also a few chew items. I really need some advice here, I'm starting to get discouraged