Amount of funding != value of company
A funding round is for X% of a company at $Y dollars, which values the company at $ ((100 / X) * Y).
Looking at two recent announcements that I follow, Aurora raised $530mm at $2.5b valuation and Nuro raised $940mm valued at $2.7b. Aurora sold ~21% ownership, and Nuro sold ~34% ownership, but both ended up around the same valuation.