Masonry Media Grid – can't add more pictures

Hello,

I’m having troubles with the Masonry Media Grid.

I use it to add photos to my portfolio. Here you can see an example: https://www.marcograssiphotography.com/portfolio/space-oddity/

Last night, when trying to add more pictures, it stopped working and now it doesn’t allow me to add more than a total of 15 pictures.

So i’ve checked if this problem was just in that page, but it looks like the masonry media grid doesn’t allow to add me more pictures in any of my portfolio pages.

Any ideas of where is the issue?

Thanks.