Good Morning Jonathan, 

Thank you for contacting the U of M Extension Service. 

From viewing your photos, it appears there are only two unusual blooms. At this point, I am not sure of an aster yellows diagnosis. 

Please click on the following link about aster yellows: https://extension.umn.edu/plant-diseases/aster-yellows

I would monitor the situation to see if you get more unusual blooms or you can be sure of a diagnosis before your take them out. 

Good Luck!