Trashed appearing in URL

Hi all,
I hope you can help me with this one. I am doing a bit of work on a website for someone and it required a lot of tidying yup. The website is in a good place now, however I did come across a link problem.

A lot of the links I click on have “into_trashed” or “trashed” in it. Is there anything I can do to fix this and just have it saying “https://naasltc.net//membership” rather than “https://naasltc.net/info__trashed/membership/” without breaking it?

I don’t want to go down the route of inactivating all plugins as I have already worked enough in the plugins and had to inactivate a few that were giving problems to the site.

Is it possible to just change the permalink when editing a page/post?

The page I need help with: [log in to see the link]