Car lusing weight when engine is knocking

So I was playing around with numbers for one forum challenge, and suddenly I realized that the fastest revision had a knocking engine
After playing around with compression and fuel mixture I found out that when engine starts knocking the car suddenly loses about 20kg, even more with more octane rating over the limit (but lap times were worse)
Images are in this thread:
viewtopic.php?f=35&t=4789
I am running build 1417. I assume this is a bug. Where should I send LUA files?

After playing around with compression and fuel mixture I found out that when engine starts knocking the car suddenly loses about 20kg, even more with more octane rating over the limit (but lap times were worse)

Images are in this thread:
viewtopic.php?f=35&t=4789
I am running build 1417. I assume this is a bug. Where should I send LUA files?