Frontend grid layout is different from the one in the grid builder

This is a rare issue related to browser limits in elements shaping. In fact Media Grid calculates in a very precise way element sizes, but browsers are only able to render integer values.
The consequence could be a “1 pixel” error on some resolutions.

Normally can be solved tweaking the grid wrapper: adding a DIV element slightly smaller than original container.

<div style="width: 99.5%;">[THE MEDIAGRID SHORCODE]</div>

do that in WP editor, “text” mode.