Settings resetting when I update plugins

Hi

Please can someone tell me what the correct way is to update the main plugin and its add ons? Because every time I try I get the following problems;

I disable all the addons when an update is needed to the main plugin, and I get an error message with a white background and black text every time I do this (cant remember what it says), so you assume the deactivation of all the add ons hasnt worked, but it has when you go to look.

Then I update the main plugin and then reactivate all add ons. Is this correct?

Then I find that every time in the prices and payments sections my currency has been reset from GBP £ to USD $ which is kind of annoying because I might forget to fix it every time.

Also, the claim listing function messes up and resets to not even showing to visitors. Options are all wiped out. Again, I may forget to do this, and maybe other things are also being reset which I’ve already set in the past?

Is this a bug?

Thanks