In Blackbaud Sphere, a confirmation email is sent when a donation is made. Within the confirmation email, there is a link to a pdf version of the confirmation where you can download for tax purposes. This solution covers the reason why the text 'Void' sometimes appears on the top of the pdf version of the donation confirmation email.
The text 'Void' will appears if the event/form is still in 'Preview' mode. When the site is in Preview mode, the site is in testing mode. No real credit card can be used and if there are offline (cash/checks) transaction used for testing purposes, all will be wiped off when the event is made 'Active'.
Once the event/form is activated, the text 'Void' will be removed from the pdf confirmation automatically.