I asked a professor for letters of recommendation for 7 universities. I was able to view his review for one particular university and it was extremely, unnecessarily negative.
When I confronted him, he denied submitting this review. However, on comparing the negative letter and the actual letter that he forwarded, I found that the first paragraph of the letters are the same except that the adjectives are all negative. I have no way of knowing if it was him who submitted this. If so, there is a possibility all the universities received this negative letter.
What do I do?