UI broken when hovering last Datasource tile

When having at least 2 rows of datasources, when the last tile of a full row is hovered, the UI breaks and there's a row in the middle with a single and right-aligned tile.

See for how it looks before hovering and to show the problem when hovering the last of the first row, "XaFour". It happens with whatever number of tiles per row and whatever browser width (as long as wide enough for more than single tile per row).