why there is fluctuations in Max available quota?

Summary:

Hi,

We have quota configured based on time slots in our instance.

recently we have noticed that quota value is not same as Max available due to that client is not able to use max quota available.

I tried to change quota value as it is read-write but only on that respective day.

please help me to set quota value same as its Max available value.

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

23D Service Update 2 (23.11.2.0.2)

Code Snippet (add any code snippets that support your topic, if applicable):