There are a few possible reasons for this — coracle loads a fair amount of data in the background, like DMs, groups, relay selections, profiles, follow lists, etc of people you follow, which requires connecting to relays, which often implies signing an authentication event. You can turn this off in settings.

Another thing that happens in the background is decrypting various messages, lists, or settings. That can create some chatty dialogs too if you don't accept all.

Finally, I'm in the process of prototyping an interoperable "seen status" event kind which tracks when you last checked your notifications or various conversations. These will get created when you visit your notifications page or open a conversation.

If this doesn't explain it, send over the signing request (in particular the event kind), I might be forgetting something.