All J-1 and F-1 visa applications are now subject to greater scrutiny, which has slowed down the process in all countries. I suggest that you contact the sponsor, explain the situation, and try for another program start date, maybe January 2026. If they say no, you will have to look for other sponsors and programs and re-apply. Many in your situation are now looking at other countries such as Canada, UK, and Australia instead of the US. Good luck!