I had this problem a while ago with custom camera views I had mapped to the numpad. I would press the keybind ,which I had mapped to my numpad, and the camera would cycle really fast between the default view and the custom view I wanted, instead of just going to and staying on the custom view.
The fix for me was to go into keybindings and swap the primary and secondary keybinds. There is a box that has the default keybind and a box that has the secondary keybind, just re-keybind them in the opposite column. I’ll login to the sim and take screenshots of what I mean.
So just swap the keybinds so the one in the left column is now in the right column, and the one in the right column is now in the left.
Interestingly, I have to have the default keys keybound though. If I just have the custom keybind I want and the secondary slot empty, then none of them even work. But swapping columns like I said did the trick for me.
I know it sounds silly, but it worked for me. Please let me know if this helped.
Here is a link to the original forum post that helped me. Problem changing custom camera views