I already posted a question regarding this issue, never get any solution. So posting the same question with more details and findings.
For the circle images, I am using
It looks as if you are displaying the circles in a ListView, which has a fixed height of the cells per default. It seems as if your cells are simply not high enough to give the CircleImages the space they need. You have two options to overcome this:
<ListView RowHeight="60" ...>
HasUnevenRows="true"
<ListView HasUnevenRows="true">