Can't find Broken Link URL

Hello! Please help...😁

I am using SEMRUSH to find issues with our website (https://marenjo.com). SEMRUSH reports nine locations where I have the same broken URL link. See attached screenshot of the SEMRUSH report.

These pages experienced a significant decrease in impressions on the Google search console. So I suspect this may be the reason.

It all has to do with the blog category named "Martha's Story."

I can't find any links it says are broken on the pages it provides.

So far, I've tried the following:

1. Surfing to "https://marenjo.com/the-bible-and-the-english-major/category/Martha's+Story"
   1. I get a 400 Bad Request error, as suggested by SEMRUSH
2. Opening the page source and searching for "https://marenjo.com/the-bible-and-the-english-major/category/Martha's+Story"
   1. I didn't find any links without the Unicode
   2. I find "/the-bible-and-the-english-major/category/Martha%27s+Story" in the page source, but I can't see where to change it on the page.
3. I've tried to add a URL redirect but haven't gotten that to resolve the issue.

I suspect it involves mixing Unicode and non-Unicode, specifically with an apostrophe. However, I haven't found any help articles on those issues with blog categories.

Please help!

Thanks,

Matt