graff - you have described the way it works perfectly. I should have included it in the original post. You also pinpointed the issue, namely a second focusout was happening when leaving $entryThree, even though it was never seen while running the GUI. Thank you

In reply to Re^2: Callback is being executed twice by Tk::entry widget by perlingRod
in thread Callback is being executed twice by Tk::entry widget by perlingRod

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