Video with multiple audio tracks not being recognized.

First off, I am using Premiere Pro CC 2019 on my desktop running Windows 10.  Also, sorry in advance for the length, I'm just trying to provide as much information as possible.  I am not very experienced with this software, I just bought a one month subscription to finish a project two days ago.  The project is of gameplay footage with voice over during the gameplay.  The files I was editing were recorded with a screen recording/streaming software called OBS (Open Broadcaster Software).  OBS gives you the ability to record up to 6 audio tracks within one single file.  I was using two audio tracks, the first for in-game sounds, and the second for mic audio.  I have been recording files in MKV format.  I found out through the free trial that Premiere recognizes these separate audio tracks so I edited about a 25 minute long project, which took me like 30+hours because of my lack of experience.  Today I moved my computer and in doing so had to disconnect my audio interface (PreSonus AudioBox USB).  When I rebooted my computer and opened Premiere, it said my audio preferences had changed and I noticed that under the Audio Hardware tab that Audio Input and Output said "(AudioBox USB)not working".  When I clicked the drop down menu to see the other sound devices there was another AudioBox USB that did not say "not working", so I selected that one.  When I clicked on it I got a warning that said something about it changing audio files and I just pressed okay thinking it was no big deal.  I then realized that the second track of audio for every single clip was missing.  I quit out of Premiere without saving and when I tried to reopen the software it literally would not open.  I then restarted my computer and opened Premier successfully but I got a "Missing Preview Files" notification and when I relinked the files it just duplicated the first audio track for every clip.  I tried opening a new project and importing the original unedited files and it imported with the first audio track duplicated.  I know the files themselves are no different because I can open them with VLC and select both audio tracks to listen and confirm they are still present.  It is also worth mentioning that this isn't the case with EVERY file that I recorded, only ones that were edited with Premiere Pro.  All the unused files import perfectly with both audio tracks being recognized.  I am very discouraged by this considering how much time I have spent so far and would be incredibly grateful if someone could help me.  Thank you!