"Storage Limit Reached" but still plenty of room

Hi, when I try to save new files, I get a message saying that my storage is full. However, when I go to the account settings (for my own account, not collaborated folders), it says:

5.3 GB of 50.0 GB

Here's the message I got when trying to upload a new version of a file

However, I also get this message, which seems to indicate the system recognizes that I have far more space:

Here's the account settings info:


This is a developer account. How do I fix this? Thanks