First: check if is a specific car that does so. If it is at one car only, delete it and reinstall.
Second: If all the cars appear to act the same way, either remove an engine that you think causes it (engines such as the Bialbero, LS3 or the K-series and other with "compatible" entries) or reinstal SLRR editor itself.
"Probably lol. Also that sentence goes for their logic: "if not released, must be on VK"." - Coprone
"Sometimes i wonder if LocomanUSA is your relative, or even the same person..." - Bigg Boss93