Not sending to multiple recipients

Hi,

I have 2 forms on a website currently which are both configured exactly the same as far as I’m concerned. They both are set to send to 5 different emails on submission. One of the forms sends to all of the emails and the other one just sends to a default email. I have copied and pasted the 5 emails directly from the other form. Is there some sort of configuration which could have previously been added by the prior web developer which is overriding this?