I need images of where these wires go on the air handler side to make sense of what’s happening at the thermostat side.
If I had to guess, I’d say that either W1 or W2 got swapped with G or Y1, or that C is actually connected to a W terminal on the air handler. It’s impossible to tell from just one side of the wiring though, without doing process of elimination - unplug all Y, G and W wires and then energize them one at a time until you figure out which is which.
When G is connected to Rc, the blower fan inside should turn on and blow room temperature air.
When W1 or W2 is connected to Rc while G is also connected to Rc, the system should blow hot air.
When Y and G is connected to Rc, you should hear the outside compressor and fan turn on, and the indoor blower fan should blow either cool or warm air.
When Y and G and O/B is connected to Rc, you should hear the outside compressor and fan turn on, and the indoor blower fan should blow the opposite temperature air that it blew when O/B was not connected.
Note that connecting the wrong wires can blow a fuse or destroy your transformer if you do not have a fuse. It would be much easier and safer to troubleshoot from pictures.