Strange bug with flares

[Apamedvapen]

I have a rather strange problem with the flares in the game. Each time I lit one up, and throw it away (only THROW, not dropping them) a strange bug makes the flares to "sink" through the floor disappearing. Quite annoying, but I can survive thought.
I don't think this is any driver issue or something related to that. I have updated all drivers.
A new game or loading a previous save state does not solve the issue, unfortunately.

Sorry if this has been mentioned before. I checked carefully, but couldn't find another thread regarding this issue.