I have My Q garage door opener and within the last few days I’ve started to get false messages saying my garage is open when In fact it isn’t.
If you are seeing incorrect status from a Tilt sensor and MyQ hub, usually that indicates either the Tilt sensor is not oriented properly (but this should happen from install, might have gotten knocked loose though) or the Tilt sensor battery is low and not reporting consistently.
First check to make sure the Tilt sensor on the door is mounted properly still, then replace battery.