I had a tillandsia that did the same thing. As the buds opened, the flowers were brown and dead looking. The buds were there for months, and didnt open till the weather just started getting cold. Also, I had just moved it from its spot under my tree to the greenhouse. I assumed it had something to do with either the change in location, or the change in weather. I dont know that is what it is, but thats the changes it had at the time.
Vrieseas are pretty easy to seperate. Some people, however, prefer to grow them in large clumps. Most of the time all of the new plants will flower at the same time just as your two did.
The easiest way is to just gently pry the offsets apart being careful to part them on the more woody base. You can use a small knife to slice down through the jointly connected part. The offsets root easily, just don't pot them too deeply.