Instagram - videos get blurry when uploading

I have Huawei P8 Lite (but same problem with P6). When I upload videos to Instagram they all become red and blurry. (sorry, could not post a screenshot of it, since I'm new here) If I try to upload some old videos on the phone, they are perfectly fine. But there are no difference in the way they're recorded. If I log on my Instagram-account on another phone, there are no problems with the uploaded video. Also on my phone, in preview mode on Instagram it's totally fine. I don't use any filters or anything. Even boomerang-videos get this blurry effect. Please help me, I've just started to really enjoying Instagram, so this is very annoying.