While checking my upcoming stays I saw 2 reservations for the same dates! Checked with the hotel and they could only see the 1 I made. Of interest is 1 reservation had a 1 day cancellation policy and the other had 3 day!

Checked website - did not show the duplicate reservation BUT it also did not show another reservation (different date) that was upcoming.
So -
1) if I rely on the website I could miss cancelling a reservation I don't see (or make a second reservation for the same date not knowing I already had one)
2) If I rely on the app and see a double reservation - who knows- I could think I cancelled a reservation that the hotel doesn't see or ?????
All in all if I didn't use tripit I would have NO idea what my reservations actually are!
Shame on Marriott IT