Slices sliced other images (email signature)

Hello,

I just created an email signature which includes 6 different links.  One for my web page and 5 for social networks.

At the bottom I placed an image from photography associations I belong.  The final image looks great.  And when I create the signature in Outlook it also looks great.

I can see my emails sent and signature still looks perfect.

But at the recipient's email (Gmail, Outlook, Hotmail) the bottom image looks "sliced" and it matches the slices created for the links.

Am I doing something wrong? Is there any other way to do this?

Thank you

Please see image