fotographie blog featured 3 column thumbnails not displaying properly ipad pro

Hi there, thank you so much for your wonderful themes and great customer support. I am currently interested in upgrading to the pro version of the photographie theme but have an issue with the thumbnails great looking 3 column images displaying terribly on my ipad. It is only displaying 2 images with the third on the next line which looks terrible. is there an easy css fix that will resize them? Is there any other way to fix this? It looks great on my desktop and appropriately changes to something usable for small phone screen but look terrible in portrait mode on tablets. any help would be greatly appreciated. here is my site www.amandasochan.com