A cap front is not flat, and it does not sit still. The fabric curves away in two directions, a seam runs straight up the middle, and the cap frame grips only a limited area of a panel that wants to move.
Run a flat-goods file on a cap and the design walks. Stitching left to right drags the fabric ahead of the needle, so by the time the machine reaches the far side the registration is gone and the logo sits crooked on the head.
Cap files are sequenced from the center outward for exactly this reason, and the layout is planned so lettering never fights the center seam. If the same logo also runs on polos, that needs its own flat file: see digitizing your logo for flat garments or left chest sizing.
If your caps come out crooked, off-center or with gaps that never appear on polos, the file is almost certainly a flat-goods file running on a cap frame. That is a digitizing problem, not an operator problem.