Maybe you could try to delete the environment files. Sometimes these get corrupted and these kind of things happen. Or there's some temporary file in your project folder. Try the following:

1. Go to your project folder and see if there's some file with a really strange name. Sometimes Vue creates these as temp files and doesn't delete them. These create confusion afterwards. You can just delete it.

2. If the above didn't solve, find the Environment folder in the Vue installation folder (normally c:program filese-on software...). In this Environment folder there should be several files with "env" extension. The "collections.env" you shouldn't need to delete (these are the libraries you defined) but the others you could try to delete, one by one (with each deletion checking if Vue already works). Vue will create these files again but, for example, if you delete the "config.env" you'll lose the changes you made in the configuration.

Hope that helps.