smitaswaika,
The problem could be caused by the style sheet used by the current page is different from the style sheet that is used by the editable area.
Please use the Editor.EditorWysiwygModeCss Property to specify the correct style sheets.
Editor.EditorWysiwygModeCss Property
Specifies the location of the style sheet that will be used by the editable area. Multiple Style Sheets are supported. Example EditorWysiwygModeCss="example.css,~/portal.css,/default.css"
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