Activity Feed - App vs. online

Hello, I am new to this forum and honestly I do not know much about this system. I use it for a rental property. I noticed today that the Activity Feed that I view on my App on my phone lists completely different activities/notifications than when I login online and look at the activity feed there. For example, on my phone app, the last Activity I see is “Front Door Sensor - Closed” 10:41 AM. However this is not listed in the Events list on-line. On-line the last event I see is “Front Door Sensor Closed” 2:41 PM. Is that because on-line is using a different time system? I realize this might be a dumb question, so feel free to laugh at me, I’m just trying to figure it all out.