Chrome browser must not be used for speedtest

I have a 1000Mbps GPON FTTH installed at home.  Using Chrome browser for speedtest, I can only have download speeds around 350 Mbps while upload speeds are always below 250 Mbps.  But when I change to IE browser, things are quite different.  Download speeds are boosted to 800 Mbps and upload speeds around 600 Mbps.   I recalled that I had not seen such discrepancies in 100 Mbps broadband services.  I will attach screen dumps to show what I have experienced later on.  I really like to know what is wrong with Chrome.