Tiles in modal popup

I’m trying to place tiles in a modal (popup) but they’re not sizing properly. However, if I have the popup open and resize my browser window, they kick into place. I know this is probably out of the scope of this forums support but anyone ever run into this issue & have a fix? Thanks!

Here’s a screenshot of what I’m facing. The top part of the photo is what appears when I click the link to open the modal & the bottom pick is what happens after I resize my window (which is what I’m after).

Thanks again,

Mike

https://wordpress.org/plugins/wp-tiles/