Nobles got a buff in the recent Teamfight Tactics 9.16 patch, so they've been seeing quite a bit of play ever since. It appears that they were getting a bit too much play, because Riot has decided to revert the buff that had added 15 additional Armor and Magic Resistance to the synergy. The number had gone up to 75 and has been brought back down to 60.
TFT Hotfix - We have reverted the buff from 9.16 to Nobles. This is live now. Enjoy the weekend!
Armor & MR: 75 >>> 60