Message Monitor Doesn't Display All Errors

Hi,

I have a strange problem with PI Message Monitor.

There are some error messages on Message Status Overview tab (let’s say 100). When I click on the number of errors, PI switches to Database
tab and should display these 100 errors. However sometimes it displays just part of it (for example 58) or none at all.

Any idea what’s the problem here?

Thanks in advance,

Pawel