at first I thought maybe the main image was a .jpg with the additional ones either a .png or .gif ---I found that if you start with a gif the additional ones need to be a gif too.
but they seem to be .jpgs too which leads me to think maybe the size restrictions you added are possibly too large for the space you have.
play with the percentage and instead of 60% try 33% or something like that just to check out the theory
or remove your restrictions to see if it behaves properly and try to do the sdjustment in store admin/configuration/images for both the regular image sizes and the ih2 section.
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