The cache on your OpenCart should be cleared after every change you make with your popups.
Follow the steps to go through this process correctly:

Go to the Settings section in your OpenCart dashboard:

In the Developer Settings section, refresh the cache clicking on the orange buttons for both Theme and SASS:

Then go to the Modifications section of your OpenCart Dashboard:

Click on the refresh (blue) and clear (orange) buttons on the top right side of the page and you're done:

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