Heat only works if I say O/B wire is not connected

Hey everyone, I had this issue last year and haven’t had to address it again until it started to get cold. All my wires are connected correctly. When I select heat and set temperature higher than inside temp, no heat is provided, just cool air.

I remembered this morning about this issue last year and if I go into my wiring configuration and I reset and deselect the O/B wire, then the heat comes on.

Now at this setting, if I just selected cool again, the cool air will not come on.

So only cold air if O/B is selected, only heat if O/B is deselected.

Any input? Thanks in advance!