Those results looks fine. The issue you are seeing seems to be the same as the one reported in
this post some time ago. I am still working on that issue - unfortunately it has been difficult to track down as only one person has reported it so far.
If you could answer the following questions it may help in tracking down the issue:
1) How many channel/query/etc. windows do you have open in mIRC when this happens?
2) Are the windows open on the desktop or in mIRC? If on the desktop, if you move them inside mIRC, does that help?
3) Are you maximizing the windows? If maximized, if you use them without maximizing them, does that help?
4) How long does it usually take before this issue appears?
Thanks!