Threaded icloud.com mail in iOS Mail app

Hi everyone...

Earlier today, I wrote an email from my iCloud.com email account via the iCloud web interface on a PC. Later in the day, I responded to the same thread via the mail app on my iMac.

So when I open up my mail on my iPhone, there are two separate email threads for the same message.... with the second one starting when I emailed from my iMac via the mail app in osx.

Also, it seems like anytime I reply to a message on the icloud.com mail, it creates a new thread within the ios mail app, even though its all part of the same email string.

Any ideas?