“sometimes” if there are issues like this it can be down to how the vinyl has been stored.
You take your roll of vinyl out of the box and you stand it on its end on a concrete floor.
Particularly in colder weather, the concrete is very cold and the cold passes up through the lower section of the vinyl. if left long enough the paper liner carrying the vinyl can become damp, to some extent.
but let’s just say one side is very cold. you put it into the printer and the first thing it hits is the heaters. the side that’s dry warms up as it should but the side that’s much colder can form a very slight wave or even rise a little. Of course, this creates problems and a big one is a head crash!
Most manufacturers have their media stored inside a nice thick plastic bag with plastic ends and encased in thick cardboard boxes to eliminate moisture types of issues as well as impact damage. but not always if you buy part rolls that have been converted to part-rolls in-house.
However, no matter what, even if in a box etc. one side can become much colder than the other if stored on its end on a cold concrete floor, or similar. so it is worth considering, particularly when we head into winter.