Mine just started doing that this spring. I think the latch is pooched. The latch is integral with the cover it seems, and the whole cover would have to be replaced to change it. I am thinking of gluing in some kind of magnetic catch, just have not got around to it.
2017 Escape 5.0 TA (someday soon, I hope
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln