NFA 7 reported link speed incorrect

I am new to NFA and have just installed v7. During the trial period, I didn't see any problems with the bandwidth usage being reported, but after making traffic changes on one of my main links, NFA is reporting impossible numbers.

Example:
Yesterday, I moved a lot of additional traffic onto a core T1 link in preparation for some network design changes. Standard 1.54mbps pipe handled an Adtran 4305 router running AOS v17.02.03. While downloading a large update file through this T1, NFA reported a max speed of 41.64mbps and an average speed of 1.65mbps in the "last hour". I configured the interface with a bps speed of 1544000, so NFA should be aware of the max rate on this link.

FYI, I realize that Adtran has a problem with at least some recent versions of AOS where Netflow was not reporting properly. v17.02.03 is post-fix, so NF packets from the router should be correct.