Errors after migration

Hi

I have used your “shipper” plugin to migrate my small multisite installation (https://www.af-ksa.com/) to your hosting environment, and shipper reported a successful migration. When I checked up the website, a lot of the settings went missing, so I tried to fix some of them, but wordpress is refusing to save the settings, example: I try to assign the main menu in the subdirectory website (https://babied-giveaway.wpmudev.host/riyadh/) but after selecting the main menu and saving, it drops the action!! Appreciate your guidance on solving this issue!