Because the survey company has to remove it when they close the survey. Once they are loaded on your page, they stay there until you complete one, or the survey company pulls them. WGT has NO CONTROL over any of that. I do surveys also, and I know your frustration with not finding out until you're almost done with a survey before finding out,"sorry you don't qualify for this survey". But that won't change.
Good Luck
Phred952