Paypal payment notification combines two orders in one email

I update from v1.3.9 to v1.5.1 about a year ago. Everything works fine with Paypal payment gateway. However in the last few weeks we notice that the payment notification email from Paypal combines two distinct orders in a single email. Is this due to confuguration problem or an anomaly. I wonder how two orders several hours apart are being combined in one email. I am attaching the contents of an email as a pdf file. You will notice the payments of Haidiki Homma and Rathakrishnan are included in a single email. Please advice if a solution exists or should I approach Paypal?

Which of the three built-in versions of PayPal are you using?

Paypal express checkout

Those emails are from PayPal. You'll have to sort the issue out with them. They did not come from your Zen Cart store.

After contacting Paypal, I finally solved the mystery. It is gmail which is doing it because whenever it sees same sender and subject line it combines the emails thinking they are part of the same "conversation". However you can turn off conversation view in Gmail by following the instruction given on this page : http://email.about.com/od/gmailtips/qt/How-To-Turn-Off-Conversation-View-In-Gmail.htm