My contact forms don't always go through to everyone they're supposed to...

I have the enfold theme, very very popular theme, and before I go into support with them...I thought I'd ask you guys.

There are 3 people on every form on my site---and I have many, but not every person receives the forms that are submitted every time that they're submitted.

For example, yesterday at 9:50 am a form was submitted...and I received it at 2 emails on the form, but a third account did not receive it. It's not a totally uncommon event, and I'm frustrated with that. Can you advise?