Why did my credit score drop so much?

I had a 714 Experian Vantage Score last week and it had just gone up A LOT because I had to dispute quite a few items on my credit report because of fraud. About 9 items were removed, and then one item got added today (a utility bill that I know NOTHING about, so I disputed that). I haven't applied for any credit, and consider myself smart with credit. NOW IT IS A 610! WHY?!?! It is the same score (vantage score) and the same bureau! Any answers would be greatly appreciated! Thank you in advance! 10 pts best answer!