Issues with email signature not showing up correctly

Issues with email signature not showing up correctly

I've recently set up my Zoho mail account, and I've noticed some issues with my signature doing funny things such as the logo image getting blown up really large or showing up as an attachment or as text. The text next to which has my name and title is also sometimes showing up one line lower which shifts the whole arrangement. It seems to have different problems depending on the recipient. Would anyone be able to help me fix this? I've emailed support but haven't heard back yet, and it makes my business look unprofessional.