Very urgent: Does not count every visitor


My Matomo has not been counting visitors for 1 week.
I found this out because
1: until now I had an average of 25 visitors per day now only 2 per day
2: Because I still have another visitor counter (banner exchange) There it is stated that 20 visitors have visited the page.

I have not changed anything in the installation.
Is it possible that Matomi has blocked some IP addresses? If so, where do I see this?

Thanks for the revenge answer.

See here: