Transfer speeds reported by progress callback incorrect

[logiclrd]

I have a project now uploading files to B2 using both the simple .Files.UploadAsync and the chunked .Parts functions, and the progress callbacks I'm getting have some really weird-looking values in BytesPerSecond. They seem to be approximately 100 times too large. For instance, an upload of a ~25 MB file takes about 2 minutes here, and the entire time I'm getting progress updates telling me it's going at 15 MB/second, give or take. Am I doing something wrong??