Single product template not saving

Hi there,
I’m having an issue with editing the Single Product template. None of the changes I make are being saved. I even tried switching to a completely different template by selecting one of the pre-designed options from Greenshift. While the changes appear correctly in the Site Editor, they do not show up on the live website.
Could you please help me figure out what’s going wrong?

Thank you in advance!

The page I need help with: [log in to see the link]