Woocommerce customer emails are sending as plain text, not my custom templates

Hi there,

My woocommerce customer emails, in particular, the “processing order” email is sending as a plain text email. All other emails send in the customized template I have used to create a nice, proper email, but just the “processing order” email is sent as text.

I used the plugin Email Customizer to help create my customer emails, but it’s a problem that this one particular email isn’t been sent in it’s correct form. It shows up on Email Customizer as plain text, and also shows up in people’s inboxes too like this. The problem happened randomly, it used to be fine and now has become and issue.

If you could please help me that would be great ASAP as I’m close to launching but can’t have my emails looking like this ??

Much appreciated,

Lauren