While the errors in the surveys triggering-logic led to an undefined behavior in the mobile app, other participants would most probably face issues in near future. To prevent escalation of this issue I’d recommend to update the problematic surveys using the online editor as soon as possible. Also choose to update participant devices (Yes. Update devices for all currently-enrolled participants) when publishing the changes, or if you have access to participants let them know to choose
Reload Studies from settings to receive the latest changes.
In terms of the issue, if open up the survey in the editor you’ll see the period start/end is set to 2019 days after joining date, it is because an absolute date
2019-xx-xx xx:xx:xx is set in the json while it should have been a relative date
x xx:xx:xx as the format property is set to relative.