Gitignore Unity not working after push and pull

I'm trying to set up a team with GitHub but whenever someone pulls files onto their computer the .gitignor file renames itself to blank and does not seem to be working. I still get the "The file will have its original line endings in your working directory. warning: LF will be replaced by CRLF in Gemfile." errors along with more LF to be replaced with CRLF errors

I've tried putting in many different .gitignor for unity file and putting the file in many folders at different levels. None of this is working. The person who pulled the git file cannot push it back because they get CRLF to LF" errors. What am i doing wrong!?