BF2S Forums Wakew Island mystery

I was playing commander on Wake Island last night and camped in the skip at the Chinese air field. after a while i decided to move towards the flag, I was shot when about 40 yards from where the tank would be. I could not work out where it came from?. So i put a uav on the airfield, i found out that 2 players had got inside the house next to the tank and were shooting people without the worry of them shooting back. Has anybody else seen this problem, surly it is blatant cheating.