I'm not sure whether it's my save's fault or the mod's. So, I decided to play a new game as soon as I installed the mod. Now, as I felt ready to start my own kingdom, I started to convince lords. But then a problem showed up.
Here are the screenshots:

http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=928028796
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=928030127
http://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=928030474

Apparently, the lord I was convinced was actually joined another lord. Plus, he already left the realm (which is kinda spooky imo)

I tried to verify the integrity of game cache and it didn't work.

Thank you in advance...