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I still have a problem. My chocks aren't set and the parking brake applied shortly after landing. I was turning around on a taxiway and retracted my flaps to 0. After doing so, My parking brakes applied and wouldn't budge. Please help

Hello guys, I still need help. I was messing around Friday harbor with the 777, and as soon as I landed everything was fine. I was turning around to taxi backwards and close fsx, however the parking brakes randomly applied and wouldn't disconnect. I have already checked that the chocks aren't set. I have no idea what is happening. It happened as soon as I retracted my flaps to 0. (the plane ISN'T a pirate copy) PLEASE HELP. Thanks