Jetpack is an awesome plugin, but in jetpack there is a feature which is Lazy loading for images. It actually changes the design of the Masonry Gallery.

If Jetpack plugin is installed on your website, and lazy loading feature is enabled, so we recommend to disable the lazy loading feature by following the below process:
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Deactivating Lazy Images 

1. Go to WordPress → Dashboard Navigate to Jetpack → Settings → Performance. 
2. Scroll to the Performance and Speed section. 
3. Click the toggle to deactivate Lazy loading for images.
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After deactivating lazy loading for images, kindly check the frontend, and Hopefully you’ll get the nice update.