Problem with notifications on the Android app

Please fill out the following sections to the best of your ability, it will help us investigate bugs if we have this information at the outset. Screenshots are especially helpful, so please provide those if you can.

Platform (Android, iOS, Website):
App version number, if a mobile app issue (shown under Settings or About):
Current (automatic update on)
Browser, if a website issue (Firefox, Chrome, etc) :

URLs (aka web addresses) of any relevant observations or pages:

Screenshots of what you are seeing (instructions for taking a screenshot on computers and mobile devices:

Description of problem (please provide a set of steps we can use to replicate the issue, and make as many as you need.):

Step 1:
Open the app
Sometimes marks appears for new comments, sometimes they don’t…

Step 2:
Open one observation that does have the mark, and scroll to see the comments

Step 3:
Get back to the home screen: randomly some of the marks will have disappeared as if read (and obviously that haven’t been)