If you're looking at your profile videos on the mobile site, you'll notice that they appear in reverse-chronological order according to the upload date. If you're logged in to your own account, you'll also see your own private videos in reverse-chronological order.
In the Android and iOS apps, you'll see profile videos in the creator's specified order.
⚠️Note: The order of videos appearing on the Android and iOS mobile app is different from mobile browser web pages and these cannot be synced.