Why are my product titles and descriptions changing back to default?

Hi, many of the titles and descriptions have reverted back to the stock option. I named each product and gave detailed descriptions, but they are gone and replaced with titles like “65437TH” and no descriptions. I have no idea where to find the copy I made or how it was replaced. But the website SEO still has the correct name though, that was altered but it is not reflecting in the title. Anyone else run into this issue and know how to resolve it?