If I’m reading your post correctly, despite only one of the 2 running, both are showing up as running in Sense?
This could be a false trigger caused by something else in your house that Sense is thinking looks like your washer.
Your best bet at this point us to go to the device listing for the washing machine when it shows running (but actually isn’t), click on the gear icon on the top right side of the display, select the “manage” tab, and at the bottom of that screen click “report a problem”. One of the 2 options there will be “Device is not on”. So long as you’re sure said device isn’t actually on, click it.
This should cause the device to go to the “Off” status in Sense, and will also help train the Sense system to better realize when it’s perhaps detected incorrectly.