Surplus bug in my AT

Today   I had an interesting experience with one of my INF (Infantry) AT's (Assault Teams). somehow it ended up with 32 out of a 24 maximum terrain vehicles. It said I could resupply for -520 WF (War Funds) meaning it would give me money, where as a resupply would normally be just 5680 WF. so after I hit the resupply button it took away 8 of the extra terrain vehicles.