The are probably going through their first adult moult. At around 4 to 6 months they loose their baby coat, and it tends to come in gradually, so that it does not get short. Then when they moult for the season, as an adult, the moult can be completely different. A lot of fuzzy lops and jersey woolies moult out like that as adults. The hair should grow in long again when they are done moulting. It is the bane of wooled breeders because they always shed their coat RIGHT before an important show. LOL. For showing, there is a minimum wool length, so a shedding woold breed like a fuzzy lop would not be showable at all.