What you see is very likely the group pings from addons that share data via pings. It's actually pretty easy to make an addon to permanently hide them. One would just need to call the SuppressPing function of LibMapPing and leave it like that. But that would hide ALL of them, even the ones that group members create by hand. A more proper solution would be to check if the ping is on the currently opened map in the BeforePingAdded callback and suppress or unsuppress as needed.
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