Agreed - we're running an experiment on Zapier integration and the callout mucked up the header. It's since been amended.
The homepage bears the scars of a lot of experiments. In pitches, I have had VCs complain about the website. I explain that we optimised for fast, messy iteration and learning. Then I explain what we've learned over X iterations. They've gone onto write cheques.
Still - it's messy and could do with a blank-slate refresh soon. We have new messaging to test.
Find an existing theme or template that is popular and covers the main type of content you need. Then just change the content as needed. Don't build something from scratch just to be special