Audio/Sound editor

We are having an issue sharing our edited short videos to Instagram. We recorded a series of interviews on a canon dslr and using a rode reporter mic, the videos are edited in final cut. Once shared the videos look great however when we try and share them on Instagram the Audio completely corrupts. The background music track suddenly distorts all the intervieews. The videos are fine on YouTube, Twitter and Facebook but corrupt on Instagram so we presume the rode reporter format doesn’t work with Instagram. All these videos are for Instagram and not other social platforms. Looking for someone to quickly convert all 10-14 (1min) videos so they are Instagram compatible. This is an urgent edit and we require this immediately and delivered by mon/tue at the latest.