strange color and extra cars in my garage ????????

No Voltic? STONE HIM VOLTIC FOLLOWERS!


No but seriously, this is an exploit with garages, since the network can't hold enough data of the millions of garages stored, it can sometimes confuse the cloud server and cause for you to have the cars but they really aren't yours. That's my theory at least, ask Cockstar or something.

Basically this. You can drive those cars out of the garage and back into your actual garage to keep them. When the game came out I  ran across this glitch many times joining and leaving races looking for a proper race (pre-nodo). The game was basically throwing me in and out of lobbies constantly and sometimes it would glitch putting me in someone elses garage. I managed to get the Space Docker and a free adder this way. I ended up in a lot of money lobbies the same way also. Racing for an hour my net income might be 3 or 4 billion because I would get thrown into DNS lobbies unwillingly.