A couple of other things:

1 - The problem is much worse on flower stems, and my other Aggie has it going on also. Just the flower stalks, no other leaves...

2 - All are pretty tight in their pots. Would a potbound plant do this? I hate to repot since they're flowering, but if the stems are deformed, the plants can't be that happy, right??

3 - It's really warm in my house... could that be the cause?