F7 PRO - MAPS keep updating indefinitely

Q1:  F7 PRO - maps keep updating indefinitely. I have downloaded all maps via wifi. As it wanted to download them always, i have updated them thru pc app Express, until no new map updates could be sent to watch (all updated). When i plug in cable to charge watch, it tries to download maps again... Downloading maps, until it reaches some value (not 100% necesarily), then it starts from 0% again. Tested on 2 open 2ghz wifis (home an work) and on 2 F7 PROs.

Q2: How to delete preinstalled maps from Express... check box is gray and i cannot uninstall some maps i will never need.