Cursor jumps to the bottom of the editor then goes back to original position when clicking on left & right side of editor window

We are encountering an issue with the RADEditor when editing a page in SharePoint. In Edit mode, there is a very small area on the left & right side of the eidtor window wherein when you click on it, the cursor jumps to the bottom of the editor window then goes back up to (or near) the area where the mouse was clicked. This is very inconvenient for users specially when trying to highlight a paragraph since what will happen is the cursor will jump somewhere at the bottom and will highlight that area instead. I've read this forum and found not exactly the same issue (but somewhat similar - i.e. cursor jumps to top of page when mouse hovers outside the editor window or when pressing enter). Does anyone know how to fix this? Any information is greatly appreciated.