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Some members have contacted me about it.
Some run on Mac, some on PC.
I myself run on Mac and I have tested it with admin and normal user on my iMac, iPhone and Mac Book Pro with the same problem.
My girlfriend have the same experience on her Mac.
No problems for admin but a lot of users have problem.
You can test it on my testprofil on the site.
Will send you a PM with login.
seem there is 3rd party extension conflict or any changes by yours at your site, I cant find it. :(
to tackle the issue I put override at:
/templates/socialize/html/com_community/layouts/notification.event.invitations.php