Version 1.70 came w several changes, but the most notable is probably T-35's, Aras' Refuge, complete overhaul. Since the new version is basically a completely different level, the old runs have been moved to a different category (pre 1.7) and a new category was made for 1.7. To my knowledge, this is the only level with a big enough revamp to justify this change. That said, if you notice something else has changed significantly, feel free to reach out and it'll get looked at.

Thanks for reading, stay fast.