No, it's not just you.
Here I am at an inn, about to swap characters. Only to find Kana missing. I found him stuck somewhere else.
The same thing happened with Grieving Mother.
I have a bug very similar to this. I was switching around party members to give certain ones XP from bounty turn ins. This all went fine, but then once I tried to switch back to my original party configuration, that's where everything went wrong. I can no longer add Kana, Durance, Grieving Mother, Hiravias, or Pellagina back to my party. At Caed Nua or at an Inn doesn't make a difference. It lets me add them to the party configuration window, but remains with me having only the main character in the party.
To top this all off, all the NPCs at Caed Nua are hostile to me. And entering the Black Hound results in a black screen(irony!). My most recent save that isn't effected by these bugs is over two hours ago
Edit: Managed to add Grieving Mother, Hiravias, and Pellagina back to my party at the Charred Barrel in Defiance Bay. Can't get Durance or Kana back in the party AND Kana is level seven instead of twelve now. I am just experiencing bugs galore!