Heya Gmnc,
It sounds like your emails are being directed to folders and inboxes where they shouldn't be. You mentioned legitimate emails are showing up in Junk while junk emails are ending up in your inbox.
For starters, something you can check is whether this is happening on the email service provider's webmail as well or if the situation is isolated to the email client you're using on your device. To do that, log in to the website for your email service provider and have a look at the inbox and such there. If this is an iCloud email address, here's a link to the iCloud website: iCloud
It looks like we're working on an iPhone. Is every message mixed up like this, or does it seem to be specific senders? Do you typically access your email on any other devices? Are you using the Mail app?
We're eager to hear back on what's happening on the email service provider's website, so we know where to go next.
Cheers!