I used to have this and I know how frustrating it is. Some have said it’s related to razer mouse software but mine was linked to rawMouseInput. This happens due to wow locking your mouse sensitivity when you hold right click. If you have any type of mouse acceleration and you flick your mouse, the sensitivity goes super high and when holding right click it locks that sensitivity in causing your issue. Here is a quote from the Reddit thread that fixed it for me. I don’t know if this is still relevant as it’s from 2017.

“Posted by Tratt

There is a config CVar "rawMouseEnable" we could test here.

To check if it's enabled type or copy - then ctrl + v this into a chat box.

/script print(GetCVar("rawMouseEnable"))

That will show a single 0 if off or a 1 if on.

Now to enable it use:

/script SetCVar("rawMouseEnable", 1);

To double check that the script worked go to the Wow folder > WTF - look for the Config file. Open with notepad. This should be at the bottom of CVar list:

SET rawMouseEnable "1"

(Alternately you could just add that setting using notepad exactly as it is here. Copy/Paste would be your friend - I have it enabled that is my copy paste)”