Upside-down Vlogs

Something we've noticed with our vlogs on some of our posts is that they're all uploading to to YouTube upside-down. When they're preparing and uploading onto YouTube they're the right way round, but as soon as they publish they've been flipped upside down. I've Googled ways to fix this but to no avail, and I've even tried to rotate the video outside of YouTube, but it's still not working. It doesn't make sense as they were filmed on different days but it seems that they just will not upload properly. I'll keep trying to find a way to fix this.