BUG: Presencing not showing the same for all users

[techsmyth]

Describe the bug
In the session Denise was seeing 8 users in the whiteboard, while I was seeing 3

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
All users to see the same presencing information

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[hero101]

When I compare the data from the events versus what I see, the amount of people shown on the top right corcer does not match.
We cannot determine who is missing, since ids give no information.
Could be due to the client now showing the right amount, but the events seem to be transmitted correctly.

Needs further investigation.