Hello!
I've created a r markdown document (htm_document) with runtime shiny. It complies properly locally and the section titles look normal. However. When I publish it to my shinyapp.io account, the titles look like this: 
I just wanted to know if someone encountered a similar problem? I realise this is a tricky one as I can't really provide a reproducible example, as it looks fine when just running the document locally.
I've downloaded the latest source version of rsconnect and the newest version of rmarkdown. I've also tried running it with shiny_prerendered, same result.
My YAML header includes the following:
runtime: shiny
output:
html_document:
theme: flatly
---
I'd really appreciate any help on this!