Is the tension correct? stitch the same on both sides of fabric? cotton could be different than silnylon
Is the correct side of the needle forward? I have put the needle in backwards and it’s weird. More like it drops stitches though. I assume by “wonky” you mean the thread comes out on one side but goes in on the other side.
Maybe you need a new needle. Maybe you have the wrong type of needle for that machine. Is the thread threaded through the machine correctly?
If the tension is correct (both sides of fabric look the same) maybe it doesn’t matter?
Good you’re testing on a scrap piece. Make sure you try sewing two long strips together and make sure the top piece doesn’t stick on the foot a little so it gradually slips relative to the bottom piece. That is, for each strip, make one mark, then another mark exactly 5 feet (or whatever) apart. Start sewing with the two strips aligned. By the time you get to the end, 5 feet away, the marks should be exactly lined up.