Checkbox button display weirdness

[Doug Lerner]

I have two checkbox buttons side by side, one is the copy/paste of the other
with the name and label changed.

When I click the first button the check toggles.

But when I click the second button in addition to the check toggling, the
button also looks like a 3D shadow button when checked.

The properties all look the same though.

What can I look for to fix this?

Thanks,

doug