LinkDisplay attribute with image in style not working for "Image Left of Text"

When i am trying to apply style to a link, and that style has image which I want to display besides link on left, and I go to properties of link, select this style which has an image and choose in LinkDisplay property "Image  Left of Text" and say my link text is "Back", on view mashup it shows "NaNBack". It should be showing first image and then text to right of it. Note In composer preview of design, it is showing correctly, but on launch of mashup it shows "NaNBack". Also if I choose LinkDisplay property "Image Right of Text" then that too works fine.