A cloud-based task management app from Microsoft that helps users organize and manage daily tasks across devices.
I have the exact same issue. Recurring tasks with reminders were created during regular time (EST). Now, clocks have switched to Daylight Savings (EDT) and reminders pop-up an hour later.
Moreover, when traveling to a foreign country with a different time zone, reminders still popped up based on EST, not local time.
It sounds that either reminders are hard coded in Zulu time, or they are served from the server based on the time zone of the account instead of the device.