Roughly normal for a soft 1000, and the firm pressure is why it is at the fast end of normal. Two habits fix most of it.
Use the whole stone. Most people work a 4cm strip in the middle and that is exactly where the dish appears. Move up and down the length deliberately, including the ends.
And drop the pressure. Heavy pressure on a 1000 mostly generates a bigger burr, not a faster edge — the abrasive does the work, you just hold the angle. Medium pressure, more strokes.
Mostly though, flattening should become a 30-second thing you do before every session rather than an event. Then it never has time to get bad.