I had a similar issue a few weeks back — some bookmark icons appeared zoomed in or blurry on Chrome Mobile. It usually happens due to corrupted favicons or a sync issue between devices. One workaround I found helpful was to clear Chrome’s cache and force a sync again.
Also, if you’re managing lots of bookmarks across devices, I highly recommend trying a lightweight bookmark syncing and manager tool. I personally use IDM Organizer, which helps me keep my browser organized and even backs up bookmarks in the cloud. Might help with long-term management.