TS215S . . . ONLY ONE SIDE WORKS AT A TIME . . . WHY?

For some reason . . . if we plug outputs, both sides to the mains, there is no sound . . . if we disconnect one side, it plays fine to that side main, and if we do vice versa, it plays for that side main fine . . . . just not if we have both sides plugged . . . . it has always worked fine for us before . . . . pls help
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