I am having an issue with how the icons and social images are showing up having used your signature generator. The signature looks fine until I send the email and it comes through like the screenshot below (sent through Outlook 16.69.1).
Email clients such as Outlook do not render HTML emails the same way. To provide some context, Outlook has a history of rendering emails to their own standard of CSS and HTML which causes marketing emails and email signatures to look different.
I would recommend following Toms's advice on updating the code of your email signature to make it more consistent across email clients.