Many places in the Map View have active text that if you click on it, a little note comes up saying "This place is at this address, View on Google Maps." This includes National Forests, Parks, etc. In my opinion, this pop-up is totally useless.
But, more importantly, it keeps one from being able to select photos if they overlap with the active text. If you click on one of the little numbered place markers, the photos at that place are selected, then immediately the pop-up from the text below is activated, and the photos are deslected! The only solution I have found is to use View > Map Style > Satellite, which gets rid of these active text elements.
Otherwise, selecting photos in map view is impossible. I'm enclosing a movie, which I hope demonstrates the problem.
Lightroom Classic CC 7.1. Mac OS High Sierra 10.13.2.
Updates to Lightroom Classic CC (8.2), Lightroom CC for desktop (2.2), Lightroom CC.Mobile (Android and iOS) were released on Monday, February 11, 2019. Please verify that your issue is fixed by the current update.