onionoo instances disagree on observed and advertised bandwidth

This is an example for relay 4AA98421045E123101DBFB811B141349739E4B4C ('relays_published' = 2015-04-25 08:00:00)

tpo's instance:

"observed_bandwidth":37601326,

the cthulhu's instance:

"observed_bandwidth":40158236

https://atlas.torproject.org/#details/4AA98421045E123101DBFB811B141349739E4B4C https://atlas.thecthulhu.com/#details/4AA98421045E123101DBFB811B141349739E4B4C

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