Where are these social icons located? In your footer?
Your footer might be a dynamic snippet. For example do you have a footer for EMEA, North America, APAC? Depending upon what region or country your profile is set to could be determining the footer you are seeing. I use this for displaying different social icons in APAC, they use YouKu, WeChat and Weibo for instance.
Look at the email in edit mode. Hover over the section in question and click the cog wheel and check what it is. You should be able to tell from the right hand side column of the edit window as well.
You were right, these social icons are all dynamic snippet indeed. We do have different headers/footers set for different countries.