Lopped eared rabbits ears start out standing up, and as they get older they eventually lop. But usually I believe the ears lop at a young age, around 8 - 11 weeks. It can take up to a few months for some rabbits, however some never completely lop.
Some lops get what is referred to as "helicopter ears" - where one is lopped and the other isn't, or both are only partially lopped and kind of stick out to the sides. Also some lops can have ear control. One of my holland lops has this - it is where their ears both lop, but they can control the muscle that moves the ear in one or both ears, so they can raise the ear up and move it, which normal lops can't do.
Another point is that you only said you saw your rabbits mother and didn't mention the father, so it could just be a mixed breed which could be why it's ears are like that.
As long as your rabbit is happy and healthy the way his ears look aren't that important. I think it's the cutest thing when Berry, one of my hollands, lifts one of her ears up. It sounds like your rabbit might just have one lopped ear, and maybe has ear control in the other? Normally lops can't move their ears that much, it's actually the one he can move that is different.
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