I wrote a paper, and my supervisor is the corresponding author of the paper, but in the PDF of the manuscript the order of authors is different (not the text we wrote as the paper, the first page of the manuscript which is downloadable). i am the second and my name listed after my supervisor's name.also, i am listed as co_author. How is the situation?
If you're unsure, you can double check with the editor, they should be able to clear it up quickly. Mistakes do happen with the names though, in one of my submissions, the editor switched the order of my first and last name. I wouldn't assume that your supervisor did this intentionally, just check with the editor (and then with your supervisor, depending on what the editor says).