The issue that you are observing could be caused by a custom CSS that overrides the default styles of the control. Please inspect your CSS and see if you are not clearing the floating of DIV elements with none!important, because this will lead to the issue in question.
In more details, there is a rgWrap class added to the elements in the pager, which will ensure the floating of those elements. If you are overriding that float, this will break the layout. Generally, you could confirm that the problem is due to your custom CSS by adding the following:
Hope this helps.
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