hl2: dm maps with long shadows issue

what title says :| the author is retired I think, but maybe someone else noticed this issue before on their servers and knows how to help.

I have these 3 arena maps in my mapcycle:
dm dogs arena v1
dm killgardens v1
dm killroofs combine v7s
and they cause these weird long shadows being cast by items and even players. When I switch to kbh (dm killbox kbh 1 and dm killbox kbh 2p), which I think are fullbright, issue is ported. If I switch to a normal map like dm lockdown or dm lostarena, the issue is fixed and I can see normal straight down shadows again, even on kbh maps. And whenever I switch again to one of the 3 mentioned, the shadows appear yet again.

This is what I've tested and noticed.. so please, any ideas?

PS: screenie here http://steamcommunity.com/sharedfiles/filedetails/?id=158852511