Unfortunately, this happens often, if there is a requirement for 1000 users to do a survey, the count down reduces as the surveys are finished, so if 999 other people had all ready completed it, then only 1 more is required, now if 5 users had already started this survey, only the first one to finish would be considered complete, the other 4 would show "survey not available", as the max of 1000 was reached.

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