DJM-REC: lower db level for exported mixes

Hello. I am using DJM-REC app on a iphone 7 and my setup for mixing is 2x Pioneer XDJ-1000mk2 and Pioneer DJM-750mk2(firmwares updated with last versions available). When I record my sets with the app and then I play them through my mixer everything is fine and the level of the sound is the same like the original track. No issues. But when I export the mix in my computer to listen in every audio program (even uploaded on soundcloud and listened with different devices) the sound level is lower. For example now I recorded a track with trim as default on mixer and in the app also by default. Through mixer everything is fine, is the same sound level for both. Then I checked the sound level from the original track and from the recorded track in my computer in a program (aimp, winamp). The recorded track sounds slower. I checked the sound level for audio programs  to be at maximum and also the volume level in windows to be at maximum. I always export the recorded tracks via dropbox or via Files from iCloud. I used many different lightning bolt cables (even new ones). I think I don't know how to set up the trim in the app. I leave the sound level in the app always by default and at my mixer I don't go on red lines. I always use WAV tracks with good quality. The Audio Output setting is always from Lightning Cable to DJM. Please help me to understand how I should configure the trim from the app so I can have a good level for my mixes so I can upload them on my internet profiles. Also I don't know what means Limiter of DJM setting in the app. Should be on or off?  Thanks :)