Sinsane2 was originally added in early 2017. Over 4 years later, a slightly different version came out, a bit more polished up with a different ending and bonuses.
I don't think it would do anyone any credit to essentially nullify 5+ year old times and grinding in favor of a project someone...
After a few random attempts I wasn't able to reproduce this on Top 100 or my development server (basically a top 100 clone), so I'm going to close this out. Feel free to ping me if/when it does happen on this map so I can get a better idea of what's going on.
Fixed, the start zone speed limiter was improperly affecting the boosts. I pulled the zone back a bit to ensure consistency, however this may affect times - please let me know if this is the case and I can adjust accordingly.