Mine does the same thing, and always has. I have a Singer, about 14 yrs old. I try to be as gentle as I can when moving the fabric around with the needle down. When I have it like I want it, I put the presser foot down, raise the needle by hand, it resets itself back to its original position (which is right where it needs to be usually) and then I continue sewing. It’s not been much of a bother once I figured out a way to deal with it that works for me and my machine. If it worries you though, I’d call somebody with knowledge of your machine.