Lower message limit for ChatGPT 4/4o than it should be

Hi, what is the reason why my limit on ChatGPT 4o is about 40 messages? ( 48 to be exact) As far as I know, users who pay for a subscription should have 80 messages in reserve, but in my case, I get cut off at 48. In my case - the subscription is paid correctly, I give quite simple requests ( like, find information about such and such company on the Internet) What can be the problem? From my point of view it looks like a bug. And if it is a bug, how to fix it?