Most embroidery problems are file problems, not machine problems. Puckering, gaps around lettering and thread breaks are usually decided when the file is built, which is why every design here is planned by a person for the garment it will actually sew on.
Tell us the garment, the finished size and the machine you run. If a sew-out is not right, reply to the delivery email with a photo and we adjust the file. Revisions are unlimited, with no time limit.