Popup elements of DevExpress controls have the position CSS property of its containers set to absolute. Thus, when placed in the relatively positioned container (for example, bootstrap grid system), popup elements may behave in an unexpected manner.
This example illustrates the issue and the way to fix it. In order to position popup elements correctly, change the container element positioning to static.
Please refer to the following KB article for more info: How to display a controls' popup elements correctly in the Bootstrap grid.
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How absolutely positioned elements behave in different containers
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