Mount Vendors not working and some other stuff

[Nohara]

I have a problem, if I want to mount up my Grand Expedition Yak or Traveler's Tundra Mammoth, the vendors on those mount do not spawn on my main character. I can see other people's vendors on their mounts, but mine do not spawn. The thing is, this is just on my main character. It works fine on all my alts.

I have tried the following:

Logging on another computer
Deleted all add-ons
Deleted WTF files
Deleted Cache files
set keybinds to default
Interface all to default

Other problems I have is that walking and flying with my mouse is not acting like it should. The slightest touch to the right mouse button makes my mount flying up vertical, but when I try to fly downwards, its almost impossible. This problem is again only on my main.

I'm getting clueless. Made a ticket, but got a very long waiting time.

Edit, after lots of searching on the various problems I had, I found a blue post telling another player to try to kill the character. Killed myself, and everything worked perfectly again. I should have done that earlier.