Okay. I got a theories on this. It is possible that the King is White and the Queen is Red because there is a balance between the two side, and when the Red Queen took over (In my headcannon she got help from Cora because it seems like something she would do) she destroyed the balance and made everything red. Because the crown she was wearing had red jewels not white one. So that implies perhaps the Kingdom has had a balance between red and white.
I agree, I don’t think the Red Queen went through two husbands. It’s also possible the king died of natural courses. The kingdom still loved RQ and she was a good queen to them, I don’t think the kingdom would’ve loved her quite so much if it was suspected she may have murdered the king. The kingdom didn’t love Regina because I think they suspected Regina of murdering Leopold or arranging it, rather than Snow White as she claimed.
The White King was a bit lecherous towards Anastasia. On the one hand he could have punished her for trying to steal the crown jewels, on the other, he probably really enjoyed the wedding night.
All magic comes with a price!
Keeper of Felix