Clustering causing some features to shrink

[wayfaringrob]

Hi, I have a point feature layer with 3 different symbol classes. They're all the same symbol other than color.

When I turn clustering on, one of these symbol classes shrinks when unclustered (single symbol) while the others grow. How can I get the sizes to behave properly? All are the same size in the Styles tab; it's only when clustering is on that the single symbol sizes are different.

[RussRoberts]

Can you share the map with me and I can take a look.