This is a thread tension problem. But, I use my sewing machine a lot for my cards. I have a pretty expensive machine--Bernina 200--and you do have to consider some things. Aside from your tension problem (in your case the bobin tension is to loose) you need to use what is called a Top Stitching needle in a size 12 for 1-2 layers of card stock. 2-3 layers go up to a size 14.
Now doing the following should take care of your problem. Usually to adjust the bottom tension you need to remove your bobin from its case and there will be a screw (very tiny screw) you need to turn it to the right (righty tighty, lefty loosey), think of a clock as you turn it and give it a quarter turn. put it back in the machine and try sewing. Keep doing this until the thread is even on both sides. You could possible turn the screw so tight that you reverse the problem, then you need to turn the screw the other way just a little at a time. Does all that make sense?
Okay, after all that, when you use a zizzag stitch, it will ziz zag on the top, but not always on the bottom. It depends on the stitch. The more detail the sitch the more the thread from the bobin show the design. This is a very hard one to explain, so please just take my word on it.
Let me know how it goes.
sewingmw
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