The "normal" parallax is fixed when viewed in Edge+IE.

Incomedia did not manage to solve this completely ( lot of bumping ) and therefore the software checks for the browser.

Explanation from INCO :

1_ Parallax n°1: The effect was improved but disabled for both Edge and IE, since the result was not satisfying enough and could cause major flickering on both browsers.

2_ Parallax n°2: The effect was improved slightly, but it was already working okay before

3_ Parallax n°3: The effect was improved for Edge in particular and should now work just fine. The effect was removed in IE since the result was not satisfying enough and could cause major flickering on the browser

The choice to disable the parallax for Edge and IE or for IE only in those particular circumstances comes from the fact that, contrary to before, it is now possible to activate the effect and have most browser users appreciate the effect without damaging others.

If before you were forced to turn the feature off because it would prove to be choppy on certain browsers, now it will simply not be displayed on those same browsers, thus not ruining the experience for the Edge/IE users, while still offering something more to users of the other browsers.

I think this is acceptable - if viewed in Chrome or Firefox all is functioning.