Why was I disqualified/screened out?
Each survey has a certain purpose and specific demographic requirements. If the answers you provided are not in line with the type of person that the survey provider wanted to survey, your data will be excluded and you'll be screened out from the survey.
This isn't always based on your demographic information. Sometimes a survey will ask the same question twice to make sure that you're paying attention and giving consistent answers. Make sure that you are always giving honest, valid answers and that you're paying close attention to the questions.