** this is the inline style used on your site**

<div style="background-image: url(/Uploads/j0262681.jpg); border: green 2px solid; height: 150px;">&nbsp;</div>

 

 

When in html view enter the above

 

when you switch to the Normal view then back it changed to:
<div style="background-image: url(http://cutesoft.net/Uploads/j0262681.jpg); border-bottom: green 2px solid; border-left: green 2px solid; height: 150px; border-top: green 2px solid; border-right: green 2px solid">&nbsp;</div>

this wouldnt be bad except if you plan on moving your site or just do not want hardcoded refs

 

this happens also in your online test editor and even on http://richtextbox.com/test/ (which doesnt even have this file located on the server)