Test if the headphone jack also has same problem.
There are so many possibilities as to be mind boggling... HOWEVER the mixer has a lot of external connections that you can test certain things are working externally.
Download or look at your user manual that shows the signal flow map... if has a bunch of lines, triangles, and squiggly things that shows how signals go through the unit and from that one can do tests to isolate the problem.
You would need to tell us if you are using the XLR or the TRS as the outputs from the mains for example.
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