contact information is different when hovering over my email

I was recently notified by a contact that when they hovered over my email they saw different contact information for me, not my name but a derogatory alias (a bit embarrassing as the info was not really nice).  they also do not see my photo. How can I make sure that my actual information is shared? Or how can I remove this other information that they see? I have a hotmail account and am wondering if the change over to outlook has affected something.