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@Arieabseo Moz is not bad at finding these. If they are lost of don't exist its because the backlinks have not been properly performed or removed. So check with the sites where the backlink exist and check. If they are there, that website needs to ensure they backlink properly.
@Caroline_Ardmoor remove the incorrect page. I see that duplicate content is in some of the products listed. If you want to keep the incorrect page (vendors) you will need to put meta info and an intro. Also fix indexing so it's the url but vendors/brand name. Could be other issues as well so email should you need more help.
@Caroline_Ardmoor and does the SEO audit mention click distance from pages? It'd not the number of clicks that matter it's the click distance. Click distance from home pages to other pages will determine which pages after home page will index after. So, ask those who did it for you to elaborate on this. What you will want is to ensure page 1 to page 2 is the least clicks. Then the next page of importance must have more clicks then the second page and so on and so forth. https://www.searchenginejournal.com/seo-and-click-distance/3851/
@rohit-c have you recently applied DMCA Protected integration. I went onto your site and I see you have DMCA. Clicking on that link shows your site is NOT VERIFIED. And this shows up as spam as content copyright is not accepted. This could be a possible overnight issue. There are other reasons but try the other's comments and this.
@TimoRossa its not a case of the name. How many followers do you have? Have you linked your Twitter to other credible sites? Linking to credible sites helps like Moz, Muckrack and LinkedIn will help this issue. Also, how active are you on Twitter? This affects it as well.
A clear answer here: the content has been cannabalised. Duplicate content can't be tweaked for Google ranking improvements. Now it's a case of removing the new website and editing your existing one. I suggest you start again because even making edits on your old website will still be a long slog after negative ranking impacts.