Sorry, no idea there...
So, if you change the order to 2, 1, 4, 3... are images 2 and 3 still not shown? or is it now the middle ones (1 and 4)? The only mildly significant different I can find between the images is the jpeg quality:
1: Quality: 90
2: Quality: 95
3: Quality: 94
4: Quality: 96
But I don't see a reason why quality 95 and 94 would not work and 90 and 96 would... Can you try storing all the images with the same quality or altering the sizes a few pixels?
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