Project has never done a good job of clearing up after changes and file bloat is quite common. Try a simple Save As… to see if that works. If not, there may be some corruption – you could try the suggestions in FAQ Item: 43. Handling project file corruption and/or bloat. FAQs, companion products and other useful Project information can be seen at this web address: https://project.mvps.org/faqs.htm
Hope this helps – please let us know how you get on 🙂
