hi all
this is a strange bug report , but it only happends on google chrome browsers ( latest version )
please see attached video , this is taken from the latest prestashop , but the bug also exist in here 
here is also a small snipped for the bug report 
  ok it seems it is heavy related to google chrome and its behavior ( and how sensitive it is to javascript i guess ) 
  if i test it on other browsers then it seems to act just fine (coulnd reproduce the bug ) 
  
  also in chrome it doesnt show the dropdown ( sidebar ) like it does in internet explorer or in Edge 
  
  if you click in edge on the setting ( like shop parrameters ) it shows a dropdown in that list like on mobile vieuw
  in chrome , it just does not shows a dropdown at all , and if it doesnt trow that error it shows the hover 
  
  Tested versions below
  Chrome version : Versie 64.0.3282.167 (bug reported version ) 
  latest version : Versie 64.0.3282.186 ( bug still exist ) 
  
  Not able to reproduce the bugs (it does not exist ):
  Internet explorer : 11.25.16299.0
  internet explorer update version : 11.0.49
  Microsoft EdgeHTML 16.16299
  Microsoft Edge 41.16299.15.0 
https://demonpower.com/video/prestashop-demo-bug.mp4 
01519465537192prestashop demo bug.zip  
Greets From PowerChaos