I'd love to take that mare for a spin. Looks to me like she's got a lot of scope, and is just saying "common, I can jump bigger than this!!" (Though I applaud the owners for not pushing her too far, too fast.)
Doesn't look weird to me but I should get you a video of my horse jumping. Oh boy he has one funky jump. He has the coolest back end but his front is not so attractive over the lower jumps. Now he looks awkward.
Weird? No. Awkward at times? Sometimes. In particular when she doesn't get to the distance perfectly she's not certain what to do with her body, sometimes rushes, usually jumps a bit flat, which is perfectly normal for a more green horse (which I'm assuming she is). At 1:15 particularly she didn't get to a good spot and got a little funky. But she looks like a jumper to me, not a hunter.
Nice horse and could be put together a bit more in her form. I would like the rider to hold her together more but these are very small jumps for this horse and so you don't really see the horse's ability. I think she is capable of much more jump and probably would use herself better and then you would see better form and bascule.