I think what you are seing is tabs being converted to the corresponding HTML entity.
In the WA_iRite/fckconfig.js file you can change:
FCKConfig.ProcessHTMLEntities = true ;
FCKConfig.IncludeLatinEntities = true ;
FCKConfig.IncludeGreekEntities = true ;
FCKConfig.ProcessHTMLEntities = false;
FCKConfig.IncludeLatinEntities = false;
FCKConfig.IncludeGreekEntities = false;
To combat this in IE, for some reason, it does not seam to affect Fire Fox however.