I had a litter, which will be turning one in April. Well, a few out of the bunch have “crazy ears” (their ears have a fold in the back and don’t sit properly, it almost makes them look like their a mix in the face/head) I’ve never experienced this before, mom/dad have “good ears” and generations back also have “good ears” My pick pup goes back and forth, some days good, some days "crazy". They all looked good 8-10 weeks, then when they came back for puppy training class around the 11-16 week I noticed the ears, some have corrected themselves, but there’s a few that are still “crazy”. What’s up with this? Any input?