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Is the filter knob turned to a position other than 12 o'clock?

I just got my DDJ-400 2 days ago, and it has been working fantastic. All of the sudden, this evening, no matter what song I play in VirtualDJ (MacOS & Windows), Rekordbox (MacOS & Windows) or djay (iPad), it sounds like the vocals are really far away, almost like the Voice STEM is turned down, but it's not. Can anyone help me with how to do a reset or something on the DDJ-400 that will fix this problem?
Thank you, in advance, for all your help.
Is the filter knob turned to a position other than 12 o'clock?

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Thanks for responding.
That was one of the first things I checked. Everything was in the right position, and the problem replicated itself in Virtual DJ, Rekordbox and djay.
I finally had to reformat/reset both my MacBook and iPad Pro. Once I did that, everything played normal, and I hadn't changed anything on the DDJ-400.
I'd love to be able to narrow down what happened, so that if I caused it, I don't do it again, but I don't see how that is possible.