QReport 3.0.9, D6 Ent., win98, epson fx880+ PROBLEM

some lines of the reports are garbled.
on the first pass the printer prints the bottom part of the line,
and on the second - the upper. E.X. 'p' looks like 'b'.

i could not figure out a specific pattern of occurance of this problem.
the printer just picks an arbitrary  line and reverses it.

thanks