Document Associated View Icon not displaying

hello Folks,

I am working on CRM 2016 Online which has been integrated to Sharepoint online via Server based sharepoint Integration.

I could see documents related to a particular case (incident) record in Document associated view by navigating to the  casename -> Chevron -> Documents , from Case form Navigation.

While displaying the documents in 'Document Associated view', it doesnt show the icon just infront of the  Name column.
Sometimes a weird image is being shown. But if I select 'All Document view', i am able to see the icon of the document type properly. (e.g. if the document having .docx extention it display word doc icon).

After some investigation i found that, while 'Document Associated view' loads , an image tries to load as below:
<img src="/_imgs/sharepointwebicons/ico_9507.gif?ver=1346561337" alt="">
(It shows 'Could not load the image' , while pointing with Firebug)

While selecting 'All Document view', a different image loads:
<img src="/_imgs/sharepointwebicons/ico_docx.png?ver=1346561337" alt="">

Please reply if anybody come across such scenario and successfully fixed the issue.

Thanks in advance,
Sathyan