No specific reason has been given but this normally happens if your
answers did not meet the required quality. Reasons for reversal include,
but are not limited to:
Failed quality control/test questions;
Answering the survey too quick;
Duplicate completed survey found (e.g. same IP or device);
Information given not matching your demographics;
Giving untruthful or contradicting answers;
Not giving detailed answers where required;
Giving nonsense/bogus answers;
It's clear that random answers or straight-lining occurred on multi checkbox questions.
While doing a survey please take your time to read and respond to each
question truthfully with accurate information. You should read every
question and respective answers carefully while making sure you
understand them in order to provide quality answers.
Please remember that giving poor quality answers will invalidate your
surveys, even if you see the congratulations screen in the end. You may
also lose access to further surveys if you receive too many reversals.