volume of rekordbox iPad

hello there. I noticed that the output of the Rekordbox iPad app is really low. Compared to the (Apple) Music App, Spotify and Djay Rekordbox is much lower in volume. Yes I have checked the output level in the settings, tried a couple of other things but it doesnt help. I checked via the usb-c to audio connector, via an external audio interface and via my airpods, on all 3 I get the same results.