This problem is not related to moving the portlets. This problem may cause due to hardware issue.
You can move portlets to any location using the Drag and Drop feature. The number of portlets you can position in a single row depends on the layout you have chosen.
Using Drag and Drop
When you add a portlet to a view, it is displayed in the View page.
You can re-arrange the portlets in a view, as required, by using the drag and drop feature.
To drag and drop the portlet:
Step 1 Click on the blank space in the title bar of the portlet and drag it to the position you want.
Step 2 Drag the portlet into its new location
Step 3 Drop the portlet in this location.
Step 4 You should drop the portlet only when two arrows appear on its sides.