@ben
This is widget settings in WP Dashboard. I am not EightTheme member but just helping you. I also purchased this xStore and I will happily help you through screenshots, if you like. you can add me on skype. My skype ID is “rayan.arts”
I am going to put a screenshot here so you can see the setting, that may help you.
Please see the red circled sections on the screenshot. also check what is the number of photos there. if it is 2 then set it to show 4 or greater than 4 to show all pictures from instagram.
you are welcome on on skype if you like more help or still this is not working for you.
best of luck.