Lightbox 'Parts' formatting changes because of too many thumbnails ???

[#1]

Everything displays properly until I add the 57^th jpeg.  Then the ‘Captions’, ‘Counter’, ‘Prev’, & ‘Next’ disappear.  Those ‘Parts’ are supposed to display on the bottom ‘Padding’.  First 2 picture the result with 56 jpegs.  The 3rd & 4th picture the result after adding just 1 more jpeg.

56 jpegs'parts' rendering correct

57th jpeg added

'parts' have disappeared

[#2]

Everything displays properly until I add the 57^th jpeg.  Then the ‘Captions’, ‘Counter’, ‘Prev’, & ‘Next’ disappear.  Those ‘Parts’ are supposed to display on the bottom ‘Padding’.  First 2 picture the result with 56 jpegs.  The 3rd & 4th picture the result after adding just 1 more jpeg.

56 jpegs'parts' rendering correct

57th jpeg added

'parts' have disappeared

[#3 · Accepted solution]

Did you try to place the lightbox and the text elements (Prev/Next/Caption, …) away from your page area to the left of your canvas? (This won‘t influence the centered appearance in browser view.)