A first look at your photo gives me the impession that the color of your filament appears darker than my grey Bambu PETG HF.
(But it could also be an issue of the photo not representing the color correctly of course.)
E.g. my grey Bambu PETG HF has much lighter color than my grey Bambu PLA Matte.
Could your grey filament possibly be an incorrectly labelled spool containing a different filament other than PETG HF?
(I will add some photos to my above post later.)