Strange double text entry in Yahoo email replies?

Am newbie to this Forum (& not so tech savvy newbie at that! apologies!). I have searched other forums, Yahoo site, etc to no avail to solve the below problem. Problem is that I have had issue with Galaxy S3 when I forward or reply to emails. It basically double sends in same message what is typed in the same message. The message recipients have all told me about it - so am trying to fix it, but don't know how? Is it my Galaxy S3, Yahoo, my Virgin Mobile carrier? Any direction you could give me would be helpful. Thank you so much!!!

An example is below of me typing in "Trying this again test", where I get 2 messages of same message I typed when I look at SEND file & also when recipient gets:

Trying this again test


Sent on a Virgin Mobile Samsung Galaxy S® III

Trying this again test


Sent on a Virgin Mobile Samsung Galaxy S® III

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