In the rules for the competition, there's this:

I. Template engine websites, tools, and sites that generate HTML from text, markdown, or script files, such as Webs, Wix, Weebly, GitHub, Jekyll, and Replit, are NOT permitted. [1]

So the fact that you hosted it on Github disqualifies you. Regardless of whether you used their jekyll engine. I would immediately resubmit it from a shared hosting provider or by setting up an S3+CloudFront static site.

[1] https://tsaweb.org/docs/default-source/themes-and-problems-2...