The question is why two of you have a different initial "working directory" when launching your program. The default working directory should be the project folder, so it shouldn't be necessary to include the project folder name at the beginning of your relative path to the CSV file.
Is it possible that two of your team have opened the Repo folder as a project within IntelliJ, and two of you have opened the Project folder?
Everyone should be opening the project, and not the repo...
If that isn't the issue, we may need to look into it more, and see what other variables are different between machines.