Hope this helps! Its the way Gmail works. Gmail archives all your mail, log into the web mail app and you will see you have an inbox and an all mail folder. Log into gmail using your web browser then go to the pop/imap settings and change the archive setting.

How do I stop Gmail from archiving all my mail automatically?

You need to go to the settings for gmail on mail.google.com and go to the "Forwarding and POP/IMAP" tab. Then you need to turn Auto-Expunge OFF.

Why is Gmail automatically archiving my emails?

Why is my Gmail automatically archiving? If your Gmail is automatically archiving the emails you send to others, then the Send and Archive feature is most likely turned on. You can disable it by clicking the Hide “Send & Archive” button in Settings.