Thanks for the report.
In Jetpack 2.6 we've updated Publicize to send more information to Facebook. As a result, Facebook gets more data and is able to create different types of updates based on the contents of your posts (length of the description, image, videos, Post Format, ...)
These new Facebook updates present more data to your Facebook friends, but the name of the app used to post is also more prominent as you've realized.
Here is how it can look, for example:
We're aware of the problem, and are working on other possibilities to interact with Facebook while avoiding this confusing app name and link.
You can follow our progress here:
I'll post again here as soon as I have some news.