Looking at the mail logs on the server it looks like your mail forwarding should be properly working. I just tried to send an e-mail with the subject "Delivery Test" to the account you have a mail forwarder setup on, and it also looked to successfully deliver to the Gmail account setup as the forwarder as well.
I would recommend checking your spam folder in Gmail, or specifically look for the messages using the subjects that you're seeing on your WebHostingHub account.
Additionally it's typically not recommended to setup mail forwarding to Gmail since they give you the ability to POP in e-mail from other accounts anyways. You can use the following guide to set this up if you'd like:
How to check your email using Gmail
Please let us know if you have any further questions at all.
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