@utu

I do not see this happening with any of 'my' own posts. But to illlustrate, it is the case with post #1 of this thread, but not witth posts #2,3 and 4 .

@ Werner

I use a 17" monitor and my font faces & sizes are normal.

It is only a trivial matter. Other readers of Knoppix forums must have had a similar experience at times but nobody bothered to report it...