Masonry / grid settings stopped working

Hello,

I’ve used Post Grid plugin for years and it works great.

Today a weird issue occured I can’t figure out how to solve. No matter what I set up in Grid settings / view type, my post grids are doing something completey different.

On the page I linked above there’s theoretically a Masonry with 3 columns on desktop screen – instead I see 2 columns inthe first row and 1 in all the rest.

I’ve made some different test grids, but the weirdness stays:
> Here https://pneumaszov.org/hu/post_grid/texts-about-us/ should be a grid with 30% columns on desktop – instead I see full width grid items.
>> here https://pneumaszov.org/hu/post_grid/1439/ should be Grid in 3 columns, instead I see 4 items in a row, not aligned vertically.

I have few things added in custom CSS, but I tried to delete them all for testing, but the problem stayed.

Do you have any idea what happened or how I could solve it? A few hours ago everything worked normally.

note: both wordpress and the plugin were updated few days ago, and I’m using the classic editor (via Disable Gutenberg plugin), so I’m using shortcodes for adding the post grids.

many many thanks for any help or tip,

Luca

The page I need help with: [log in to see the link]