1 pointSeems like it's more of a design choice rather than a bug. You can ask the theme creator about it, as they would know best. With some digging around you could probably find the JS code that is responsible for hiding all the other colors, and disable that.
1 pointThats not the reason. I´am the Hoster and Provider (https://s-corp.de) where the Shops (over 400 Prestashop-Customers worldwide) are hosted and all of them have a problem with THIS module...other Paypal solution-modules work without problem.