New images appearing too small

Hi,

Two new images have just been added in the my gallery and these are showing up smaller than the other images, even if the image thumb nail chosen is the same or larger.

The previously added images are being resized in the browser to 193px, but the new ones (the two on the very bottom row) are being resized to 157px. I do not understand why.

I’ve even tried creating a new thumb size of 190px to get it closer but it made no difference – using 150 or 190px I get the same result.

https://mrsj.co.uk/gallery

I am using Chrome on a Mac but have also testing in firefox and safari
Thanks

https://www.ads-software.com/plugins/final-tiles-grid-gallery-lite/