Hello. This issue is similar to another one
10x userpoints: Add video by button “Save” when “Create Video” https://stackideas.com/forums/10x-userpoints-add-video-by-button-create-video

1. Open conversation or create new
2. chose friends
3. press “send” (invite).
4. don’t wait for result. press “send” again, again and again.
Result: browser send it (several times).
User get userpoints few times. If you press it 10+ times, you’ll get it 10x userpoints for each user and try.

Thanks.