If you have a linux server put "linux_func_rotating_fix_engine.amxx" plugin, if you don't put this plugin 
 the second trap will stop rotating visual...

If you have a windows based server don't install the amx plugin because the bug is only on linux servers, just copy the map in cstrike/maps

For more info about the plugin go here : http://forums.alliedmods.net/showthread.php?p=385925