You maybe have stumbled upon this scenario:

After you have retracted your SharePoint solution in Central Administration, the solution flips back to deployed?

The issue seems to be that when you have deployed your solution with –allcontenturls, which means it will be deployed to the Central Administration web application as well, you must specifically retract the solution from the Central Administration web application.

So here are the steps to work around this issue:

1. Retract the solution from all content URLs
2. Retract the solution from the Central Administration web application specifically