500 mbps on phone but 100 mbps on PC

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Hi does anyone experience this one? We are paying for a 500 mbps speed sa PLDT. However, when I’m testing it on PC/ Laptop, both connected to LAN cable, we only receive around 100 mbps. I already reported this problem (80-90 mbps max sa speedtest) before sa customer service and I also requested awhile ago to reroute my line. Pero kanina lang I’ve tested it on my phone, and got 500 mbps. Before whenever I test it on any device, 100 mbps lang kaya nagulat ako when it reached 500.

btw, is it normal na 500 mbps sa phone then 100 lang sa pc/ laptop? diba dapat same lang ng speed?

ps. our connection is like this on a PC. We used RJ45 cat6. Modem -> old modem (used as extender) -> pc and laptop