Some bars disappear as console scrolls

[danenglish2]

Maybe I'm doing something wrong, but is the image below normal behavior? Some bars disappear, some don't as it scrolls?

[Paweł Kowalewicz]

Same happens to me

[Tweak[Box]]

I noticed that as time would go on, the progress bar would slowly "eat" up the spaces above it and it would overwrite anything that's above it