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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Essentially, its only a issue when you have links to both the slash and non-slash versions. I would standardize on either having slashes or not, and make sure all links on the site follow the standard. However, after hearing that they lack basic SEO, I would convert to WP.
Totally not an issue to be concerned about on any of those questions you asked - just remove the noindex tag and submit the URL(s) in WMT for Google to respider those specific pages faster, you'll be back up and running in no time.