Email Notification settings

I’ve created accounts on two different instances and tried this on both:

I go into my account settings, and try to configure email notifications. I click a few of the checkboxes in the « email notifications » column, but I can’t find a button to click to save/submit/confirm my changes. And (thinking that maybe no « submit » button is necessary) when I go to another part of the website, and then go back to the notification settings page, the boxes are no longer checked.

Is this how this works (or doesn’t work) on most/all instances, or have I just had bad luck with the two that I chose?

Oh, and I’m doing this with Firefox on a desktop computer. Maybe this is a « we only tested this in Chrome » or « we only tested this on Android » situation?