You may be experiencing this issue if you have filled all available boxes!
To see if this is correct, generate a report of your system status. This will show all available boxes.
If you know you have more outers than the system accounts for, check the details in your settings. Click here for a step by step guide to know how many boxes (outers/inners/archive boxes) your system has and how can you add more if there are more available.
If you're not sure, get in touch with our team!