What size is your enclosure? And how is it furnished? Four geckos can be a lot for certain small enclosures and you can definitely run into issues with aggression. With animals, things can be fine for a very long time and suddenly explode. In smaller enclosure this is the crowding effect where the animals are tense and partially stressed, thus appear to get along. However, when things bubble over it can result in a lot of other issues.
Regarding the missing tails, they were most likely eaten by another one of the geckos.
I would recommend separating the two geckos who have lost their tails. Or perhaps even separate all four geckos for the time being. The two that lost their tails should be housed alone and on paper towel, at least temporarily, so they can properly heal while lessening the chances of infection.
As for females laying after being separated from the males.. yes, that is entirely true. Many breeders have reported females producing viable, fertile eggs from females who have stored male sperm, for months after being separated. I have a friend who purchased a crested female from a reptile store that had her housed with a male and thus far he has gotten 5 fertile clutches from her. She is not being housed with a male, either, simply another female.
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