I have problems with correctly calibrated charts
if don't enter a SK= (degrees plus or minus) in the kap header. they work fine, but not with quilting turned on.
the utilities i've used to rip and calibrate the charts
don't automatically enter a skew, and OCPN needs a skew in order to quilt non-north-up charts i believe.
i've converted most of the Illinois Waterway charts, but they're DEFINITELY not north-up. since it's a river, they're published left to right to maximize the most river the USACE can get on a piece of paper (or in a JPG).
i'm starting to put a protractor on each of them so I can measure skew and put that into the header. but what a pain.
on the river, it works fine to turn off quilting. they're all the same scale, and one chart goes away and another comes up. fine for my needs.
take a look and see... your problem might be related to SK= ?