Deleting messages or marking them as spam doesn’t move them out of the inbox (Safari and Firefox)
When I delete one or more messages, or mark one or more messages in my inbox; they disappear and then reappear a few seconds later. It doesn’t happen every time, but maybe 40% of them time. If I delete or remark the messages a second time they disappear as expected.
This only happen in Firefox and Safari, and doesn’t seem to be an issue in Chromium-based browsers.