Reverse the cans on your head and confirm it.

So, does the interface have a software control panel? Many do and there are input and balance controls in there as well as EQ and other things.

Be sure it's not something like that.

Also look at the DAW you use and be sure you have things centered and balanced.

I'd wager it's a software or setting in the DAW on how you mix. If the other cans didn't show it to be louder on the left, that could have been done by you without knowing it. You had a deficiency in the cans and to compensate you turned one side up more in the recording process.

It could be a lot of things besides the interface being left biased.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.