UC luggage tags

I don't know how I didn't notice before...

I have realised that on my main bag for checking in, I only have 1 silver Upper Class tag left attached, I had 3 before I got to the airport in Miami (my last flight).

So I was wondering if anyone knew about any new rules like the check-in staff have to remove all old tags? Seems a bit odd, and a bit annoying as I like to build a collection.

It's not the end of the world but just wanted to see if others had similar experiences. or if it was just me. ?|

As I recall, they're not the strongest of things, and I know what baggage handlers/baggage belts are like, could have just fallen off naturally.