It seems the appogee signature is being added in plain text to automated replies such as Out-of-office replies. Looks really awful.
Gmail sends out of office emails in plain text and automatically appends your Gmail Signature. This is not something that we can change as it is controlled by Gmail.
If your signature contains HTML then Gmail does it best to display this nicely (for example it strips the bulk of HTML and adds image links in place of the images) but it doesn't always display nicely as you note.