Other possibilities are not excluded:

1) The last interview was not with the personnel department, and the hiring manager didn't know the situation, thinking that he would return his resume after the interview, because many hiring managers may be promoted internally and have never experienced such a situation;

2) It may be that the interview didn't feel suitable, so I returned my resume;

3) The personnel department has your resume on file, so it was returned.

Generally, the interview results will come out in 3-7 working days, and you can continue to find the next one. Call again five working days later to ask for the result. If you fail, you can also ask why, which is convenient for promotion. At the same time, it will not affect your job search. You can make two preparations to facilitate employment.