In the survey evaluation you can see that you collected e.g. 900 answers but only can see the first 350? The reason is most probably that you exceeded the maximum amount of allowed answers you can have displayed with the chosen product (a similar notice should be displayed in your evaluation).
Please don’t worry! Even if you exceeded the maximum amount of answers of your product, we’ll continue to save new answers from your participants. It’s now up to you whether you decide to do an upgrade or not, in order to see all answers.