Hi Christopher
It's a shame that they aren't more specific about what exactly they mean by 'javascript that does some bad calculations related to scroll positioning'.
It's our opinion that it's not Adapt that is at fault here but Safari for iOS. If you are interested you can find out more detail in this thread.
(Please note that Chrome for iOS is using the same rendering engine - Webkit - that Safari uses. Apple do not allow any other rendering engine to be used on iOS so both Firefox and Chrome for iOS are effectively just Safari with a different interface).