The Double the Donation add-on should only display their form field once on guest-donations-disabled forms.
Currently, if a form has guest donations disabled in the individual form settings, and either the "registration", "login" or "registration and login" option selected, the GiveWP Double The Donation add-on displays twice.
This happens on all three form templates.
Also, this happens only if you access the website while you are logged out OR using an incognito tab.
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