Trigger not working correctly: Submit Interaction - Hotspot

I created a hotspot quiz question. I disabled the default Submit button. I created my own Submit button and added a trigger: Submit interaction Hotspot when the use clicks [my Submit button]. In previewing the quiz question, when I click in the correct hotspot area and then click my Submit button, the feedback says I did not select the correct answer! It should be so simple, but it isn't working every time. Is this a bug? Or am I doing something wrong? Thanks a million for your help!

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