Title being added to text filtered by "content" filter

Hi, I’m having an issue with a plug-in called Sprout Invoices and it only happens with Spacious. The 2015 theme, for example, works fine.

The issue is that when I view an invoice generated by Sprout Invoices, I’m getting the Title of the invoice “post” included in multiple other sections of the invoice page. For example, if the Title of the invoice was “ABC Company”, in the Notes section I would see

Notes:
Thank you for your business
ABC Company

And in the Terms section I would see

Terms:
Payment is due on receipt
ABC Company

I contacted the developer of Sprout Invoices about this first and, after we determined that it wasn’t happening in the 2015 theme, he suggested that I ask the Spacious developer “…why it’s adding the title to any text filtered by the “content” WordPress filter.”

I don’t know enough about themes to really understand what might be happening but it sounds like he’s saying that he (Sprout) is displaying text through a content filter but the theme is returning both the content *and* the title text.

I hope that all makes sense. Thanks for any insight.