html - ckeditor font style 13 px -

i had earlier asked question it. after trying out possiblities error occurs, have found in ckeditor if copy text , paste it, default pasted <p style="font-size: 13px;">

example picture

html code  <div><p>original text</p>  <p><strong><u>the quick brown fox jumps on lazy dog</u></strong></p>  <p>the quick brown fox jumps on lazy dog</p>  <p>copied text</p>  <p style="font-size: 13px;"><strong><u>the quick brown fox jumps on lazy dog</u></strong></p>  <p style="font-size: 13px;">the quick brown fox jumps on lazy dog</p> </div> 

so if know solution above problem please answer me. problem starts when copy text , paste it.i using ckeditor 4.latest version.

why isn't nobody answering? tried using stable build 4.1.1 also. problem still there. people overcome error?

see error in ckeditor 4.1.1

the above 1 preview mode. when save data in mysql , retrive it, style applied. , second test smaller usual.