Well... Well, that could be many things. Assuming it's WordPress, I would clear your program reserve for 1 thing. Then, at that point, I would check whether recovering the PermaLinks fixes it.
Assuming you're not basically keeping crawlers from creeping your site with 404 not found, It is improbable you will experience any SEO issues. In any case, I would you unquestionably need to fix this mistake and know the reason.
Simply go down an agenda or two till you find and pinpoint the issue. That is assuming it isn't the program or the permalinks which is the thing that it is a decent larger part of the time
