Player Vending Machines Taking Damage

Vending machines players place damage bar is showing they are taking damge, but if a player tries to repair the vending machine it tells them it is not damaged and so wont allow repairs, but the damage bar on them is indeed dropping.

I havent added or changed any rules for vending machines, but perhaps im missing something on the rule set?
Any tips or fixes for this? 

hi post your config from pastebin.com only pls ty

"players can hurt scrapheli",
"players can hurt minicopter",
"npcs can hurt players",

these are redundant

i am not able to do any damage to vending machines with your config

Ok ty for the reply i will remove the redunancies and continue using and check vendings once more.