Drag and drop problems in Sharepoint

I really need help because I'm going crazy over here.

I want to drag and drop a wep part on a web part page in the same web part zone.

IE8

In IE8 I can drag and drop web parts but the scrollbar isn't working and I can't even scroll using PgDn button, so I can't move the web part down the page.

IE11

The scrollbar is working but the web part zones don't appear when I hit edit so I can't move them.

MOZILLA & CHROME

Everything works fine except the drag and drop part, I can't move the web parts and from what I've searched on the internet I understand there is no support for drag and drop in Mozilla and Chrome.

Please, is there any solution for this problem?