When you press enter, some formats are copied and some not copied, these are normal behavior, the detail are as follows:

Format not copied:
Css Class,Inline style,Normal,Font,Size,Bold,Italic,Underline,Font Color,HightLight,Superscript Text,Subscript Text,Upper Case,Lower Case

 

Format copied:
Left Justify,Center,Right Justify,Full Justify,Justify None,Insert NumberedList,Insert Unordered List,Indent Text,Outdent Text

 

Regards,

Eric