From what I've been able to surmise, everyone who had NOT yet completed the personal weekend challenge goal before the servers issues Sunday is suffering this effect of it seeming to not complete the 4th star of the Varric challenge.
I had finished it on Saturday, so my 4th star is showing correctly and I got the Varric chest for this weekend.
Once BioWare gets in the office, I'm sure they'll sort out a fix. I think they're already aware of the issue because I saw Jeff asking one of my friends yesterday on Twitter if her Varric quest gained a star or not (she was one of those affected by the server issues yesterday).