All Links Automatically Turned Into DoFollow From NoFollow

I’ve noticed that all the NoFollow links on my site has turned into DoFollow links, automatically. How is it possible?

When I’m turning them into NoFollow, saving the draft, and returning back to editing, again I see that all the links have been turned into DoFollow.

What am I supposed to do now? How can I resolve this problem? And what’s causing this problem at the first place? Somebody please help.

PLEASE NOTE: CAN’T SHARE THE SITE LINK