Web: Issue Copying Single Value in Cell and Pasting in External App

I work in billing and our dx codes are listed in a cell. As of yesterday, I haven't been able to copy a single code at a time to paste into the emr app we use. It's an excel issue as I tried pasting in a browser search bar and it's also pasting the entire cell and not one at a time. Click and drag doesn't work, and it doesn't happen on the desktop version, but the desktop version sucks for my workflow. The only thing that keeps my workflow close to consistent is ctrl+x but I have to copy my worksheet into another file so I don't lose the original data if I forget to undo it all, which would also take a lot of time. Anyone else having this issue or know how to fix?