Bhook.com checkout

The fix, in full: a min-height on each of the three slots. Nothing else changes — same banner, same EMI strip, same badges, same load times.
That is the entire difference between the two modes. Reserve the space before the thing arrives and the page cannot jump. For images, the equivalent is putting width and height attributes on the <img> tag — yes, the ones everyone deletes because "CSS handles it". CSS handles the size. The attributes handle the reservation. Both matter.