Payplans users sudddenly not showing anymore in EasySocial

Hello
Registered users (not paid users) show fine in ES.
But paid users from Payplans don't show anymore in ES activity stream or search. even though we can reach their profile using the exact url of the profile.

Also our ES dashboard online users value keeps incrementing mistakenly...
I noted that J3.8.5 was supposed to fix an issue with sessions not correctly counted. It could be related.

Thanks for your help on these topic.