Time since last event returns "?" in rule machine

As seen on the attached rule from rule machine the Time Since Event of motion on Bad equals a question mark instead of minutes. This happens sometimes - but not every time.
In this case I want the light to turn off when hubitat registers that the motion sensor has not registered a motion for more than 4 minutes. When I get a "?" the rule breaks and the lights stay on. Does anyone have a clue why the "?" sometimes appears instead of minutes since event, and how to fix it?

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