I have installed your plugin Wp Masonry for 4 years ago.
My site http://www.osg.cat is a multilingual site with the WPML plugin. The plugin Wp Masonry Layout has worked correctly until version 5.2.5 of wordpress, but with the update to 5.3 it has stopped working with wpml.
The WPML support team has told me that bug is comming for your plugin. Your plugin isn’t longer compatible wis WPML.