W3 Total Cache – Strange numbers and letters at the end of the pictures

Hi to all of you,

For some time now W3 Total Cache is putting some strange number and letters at the end of my pictures (www.blog.com/picture.gif?3F0bac62). That bothers me because I get a lot of 404 errors (crawl errors) from Google Webmaster, and if someone shares the pictures from my blog he can’t find it because the original picture, the one I uploaded on the blog does not have those strange characters.
O yeahh, Google Webmaster is indexing the picture this way:
wp-content/uploads/2012/11/Install-SQL-2008-R2-on-Server-2008-R2-5.gif%3F0bac62
It puts a procent sign after the picture name
Can someone help me get rid of those and just let the picture name ?

Thanks

https://www.ads-software.com/extend/plugins/w3-total-cache/