Almost 3 weeks ago I picked up 2 ducklings from tractor supply. I already have 14 cayuga, a blue swedish and 2 buff ducks. The ducks did great in the brooder the first week and have since moved into their own little coop outside. The crested duck started out with a small ball of fuzz on her head but now it is larger than her head and she’s having problems eating, cleaning herself, and walking. It’s like it completely throws off her balance. When she tries to eat she has to lay her head sideways on the ground and whenever I give them peas she misses 9/10 of them. I also found it weird that whenever I put them in the pool together this duck swims backwards only. If she’s standing on flat ground and look up into the sky she goes shooting backwards too and usually flips onto her back afterwards and can’t get over. I don’t know what to do. I feel like she’s just suffering. She seems to not know what’s going on 99% of the time. She tries to follow me and the other duckling but just stands there and cries like she can’t see us. I am making sure that she eats and drinks throughout the day and she is growing, her crest seems to be growing faster than her head can handle. Here’s a photo. I had also trimmed some fuzz away from her eyes a few days ago because I thought that’s why she kept falling over but it didn’t change anything