Captive Portal Quota Calculation Appears Incorrect – Anyone Else Seeing This?

I’m interested to know whether anyone else has recently experienced issues with Captive Portal quota calculations.

We have recently seen multiple reports where the remaining quota displayed in the Captive Portal does not appear to align with the user’s actual internet consumption.

For example:

Users assigned 70 GB are showing 0 GB remaining despite consuming significantly less than the allocated quota.
Users assigned 10.5 GB are showing only a small amount of quota remaining, even though usage records indicate less than half of the allocated quota has been consumed.
In several cases, users have lost internet access because the portal indicates their quota has been exhausted when usage data suggests otherwise.

I’m trying to determine whether this is an issue specific to our environment.

Any feedback would be greatly appreciated.