Tiles 2.0 (64-bit version), latest Windows 10

I have Tile's Position "Make the bar appear on top of other windows" disabled, so that other windows are on top of Tiles. That works--for a while. But after a while, Tiles will begin to force itself on top of other windows as those windows are dragged around the screen. I haven't been able to find a pattern to the cause. It's not the lock screen (WIN-L etc. lock & unlock PC.), and that "Make the bar..." option remains disabled [no tick mark].

I can temporarily fix this, so other windows remain on top as they're dragged, by enabling then disabling Tile's "Make the bar appear on top of other windows" option, or quitting & restarting Tiles.