Why are Yahoo emails that are read come back marked unread on my iPhone 6?

[iMore Question]

Emails marked as read from my yahoo account on IS6 come right back as unread.

 

[Just_Me_D]

I don't know.

1. Did you check to see if Yahoo is having problems on their end?
2. Are you running a beta version of iOS?
3. Is the same thing happening when you log into your Yahoo account online via a computer?