Hi Cassie,

Thanks for contacting us regarding your query.

There seems to be some inline CSS styling being applied to the portfolio images. 

To resolve this, please add the following Custom CSS to Appearance>General Settings>CSS/Script Related>Custom CSS Code from your WordPress Dashboard 

/*Restores Width Of The Portfolio Images*/
#portfolio-extra img{
width: inherit !important;
}

Please let me know if there are any more questions that I may answer for you.

Cheers!