I don't know your machine but a couple of thoughts to try.
Is there a stitch width button? I think center is at 3.5 on the br0ther machines, etc.
Is there a stitch selection button? It might be set on one that defaults to the left. Some machines have a 1, 2 or 3 for straight stitch that defaults to left needle, center needle or right needle.
The other suggestion is to see if a Left/Right shift button is set and causing the issue.
Good luck. I hope perhaps one of these suggestions jogs the settings.