This is usually caused by person's data being too long to fit within the snippet boundary.
When the personalized data can't fit within the blue boundary box, PicSnippets will shrink the text until it reaches the minimum font size (usually about 50% of the default font size).
If the data is still too large to fit within the boundary after shrinking, it will use the default value instead of the personalized value.
(Snippet Boundary is the BLUE LINE around the snippet)
Fortunately, this is usually a simple fix!
You just need to widen the Snippet Boundary on your PicSnippet.
To do so, just click and drag the small box (as you can see from the reference above) to be as large as makes sense given the context of the text within the image.
That's it! :)