Hi and welcome from Texas. If it is shorter, you may have stretched the others. If it's not off by much, you may can pin, pin, pin, and ease in the difference. I think if you put the longer row on the bottom, the machine will ease some of it also, seems the bottom feeds through faster than the top. Double check your seams. Sometimes I accidently bump the little lever that positions my needle and it causes me a world of trouble.