Just got a reply from EWO.
"Sorry, we are actively testing buckles here and working with our supplier to see what might have happened. The few we've tested so far appear to still work correctly, but the dimensions have changed. We've been using the same supplier for years, waiting to hear back from them and get some replacements on the way. We apologize that we didn't notice they were different - seems like not all were affected but we're still going through our inventory. Stay tuned for another update on this matter with more information."
"Sorry, we are actively testing buckles here and working with our supplier to see what might have happened. The few we've tested so far appear to still work correctly, but the dimensions have changed. We've been using the same supplier for years, waiting to hear back from them and get some replacements on the way. We apologize that we didn't notice they were different - seems like not all were affected but we're still going through our inventory. Stay tuned for another update on this matter with more information."

