Email from my Contact Page arrives duplicated

Hello - I’ve just finished constructing my 1st Sparkle website (vs.2.7.2), which has enabled me to quite easily produce exactly what I wanted. Much appreciation.
There is a glitch, though. Mail sent from my Contact or Comment pages, via the WebHost (SiteGround) server arrives duplicated. To make matters worse the two are ‘glued’ together - delete one and they both go. Put them in a dedicated mailbox with earlier similar emails (Apple Mail) and they all then exhibit this behaviour.
Has anyone else had this experience?

Hi @elliottb, never heard of that. Would you forward one of those emails to me?