Quadcortex to iPhone

I’ve already looked in the group but I still haven’t found anything, I use my quadcortex connected on the iPhone as an audio interface, and a protake app that records video and audio together, in the monitoring of the app it’s not clipping and also in the quad nothing is clipping, but when I give play on the video the effects keep clipping, I use an otg adapter to connect the quad on the iPhone, is this adapter that is giving this bad audio?