New git branch accidentally contains files from the main branch

created a new branch and switched to it

I cd into the right directory and made 2 commits on the new branch (Lesson_notes)

And then pushed the new branch to github

But unfortunately, the new branch now picked up all the files in the main branch as well.

Only the Day_27 files should be on the Lesson_Note branch.

Please what did I do wrong? I didn't do any merging or whatever but the main branch has its files and folders also the Lesson_note branch. How can I resolve this issue?