I discovered that the code exists in two places. The same code was placed on the pushbutton (PB) event of a PB on the calling form and in the open event of the called form. The code calls methods in a library. I removed the code on the calling form's PB and the doubled appearance of popups went away.
I'd put the code in two places because the calling form's pushbutton was to change color when code on the called form ran successfully.
If I could return the results , "PASS/FAIL", from the called form to the code on the calling form's PB then when focus is returned, it could respond, e.g. turn Green for "PASS" or red for "FAIL".