Hi,
Total remaining credits is the amount of credits available to your account. There can be a minor lag between running an event (like geoenrichment, spatial analysis, tile generation, viewing premium content) and seeing these credits reflect in the total available credits. It's rarely more than 10 minutes, but if you run a process and immediately check this value, you may experience the lag for a few minutes.
Storage credits are calculated differently in that once per hour, the storage size is determined in your organization and the total remaining credits is updated.
In your example, you are using Geoenrichment, so you are seeing the lag as described above when running a specific event.
-Kelly