What I can see in the screenshot is that the skin of the RadWindow does not look as expected either. This leads me to believe there may be some global CSS rules that override the positioning of elements such as table, tr, td, ul, li, etc and they may also be affecting the RadWindow (a RadAlert is actually a RadWindow). Please try turning off all custom CSS and see if the issue persists.
help article. You can also try making the timeout larger.
If the issue still persists I advise that you open a support ticket and send us a fully runnable reproduction demo so that we can debug it locally and see what is going on.
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