This has been this way since I installed all three of the U100s the same day - almost two years ago. Two of them have circular lock / unlock icons and this one has words and no icon. It’s always drove me a little crazy. OCD I know. But I don’t like it. 
I emailed Aqara about it a long time ago and got a response that didn’t make any sense. All units have the same version, firmware version, hardware version, etc. Is this a setting?
Hello @RunLikeAnAntelope
Make sure that your lock that is not displayed correctly on the main screen is linked to the hub - it looks like something is wrong with the linking because only the status is displayed. Relink the lock to the hub and this should work, then remove the lock card from the panel and add a new card.
Ok I did that. Nothing changed - still has the words and not the icon. All three are bound to the M3. I removed it and added it. And did the same with the card.