Why is my hosting service provide charging for much more bandwidth than what's reported in Cloudflare?

The Cloudflare Analytics show approximately 2.5TB bandwidth usage for a given month. This even includes cahced bandwidth. However, our hosting provide reports approximately 20x that bandwidth. How can this discrepancy be explained?

Is the bandwidth reporting on Cloudflare limited? In this particular case, ALL legitimate traffic goes through the Cloudflare account, and we have no indication that there is any traffic accessing the (unexposed) IP addresses directly.

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Cloudflare’s bandwidth analytics are pretty spot-on. Do you have a day-to-day bandwidth graph at your host that you can use to compare with Cloudflare’s day-to-day bandwidth graph?

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This is not the same 24-hour period but there isn’t much day-to-day fluctuation.