Pm's received several times by members

Hi,

Every time i send a pm to my whole forum, most of my members receive this pm several times, today it was 3 times in my first forum and about 10 times on my other forum.

Can you let me know how i can solve this? I only send the pm to 1 group where my members are member of.

Thanks,

Can you show us a screenshot of the same, possibly since it will show the same time for all three of the PM's.