Spot on.It is hum.
Mains hum for certain.
X10 is opposite of what you need. That expands the 1kHz wave and the dancing is the 60Hz modulation. SLOW the trace down and you should be able to see the 1kHz AND 60Hz components. it isn't a very practical way to view things for troubleshooting, but it should demonstrate what you are really looking at.
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