Hello, Emma Hayduscko
Welcome to the Microsoft community.
Thank you for your feedback. Based on your feedback, it seems likely that there is an issue with OneDrive synchronization and these photos of yours may still be in the cloud. You can try emailing these photos and selecting Always keep on this device. And download these images to keep them in another path, not the path under OneDrive. See if the problem continues.
Also, you can upload a screenshot of what you're doing, which will help me understand your issue. Please let me know if there is any problem in my understanding.
I look forward to your feedback.
Best Regards,
Aaron| Microsoft Community Support Specialist