Slow copy speeds on home network Windows 10. HP Envy w/1000-Base-T Ethernet

[XheVoice]

Per the specs of my computer: ENVY Phoenix 800-030qe

my LAN Is:

• Integrated LAN
  Technology: Realtek RTL8151GH-CG
  Data transfer speeds: up to 10/100/1000 Mb/s
  Transmission standards: 1000-Base-T Ethernet
  
• Windows 10 Home v1903
  
• CAT5e
  

However, windows is displaying the Link speed as 100/100 Mbps with a speed of 100.0 Mbps
And when I transfer files from one network drive to another network drive or from my computer to a network drive it is transferring, copying, or pasting the files at kb/s.
 
It is taking hours to transfer 9 GBs -- literally took half a day to transfer 5GBs.
I have just over 200GB on an old HP MediaVault that I am copying the data over to a newer Seagate NAS because the drives keep dying on the MediaVault.
 
I should have been able to complete this task hours ago. I can download GBs from the internet in mere minutes if not seconds, so why is it taking hours with a projection of days to transfer files that are on the same network, sitting next to each other connected to a 8 gigabit switch?
 
How can I get gigabit speeds?
How can I speed up the transfer speeds (copy/paste)?

[XheVoice · Accepted solution]

I discovered the problem. The ethernet jack in my office, AT&T split the cable to route part of the signal for phone thus limiting my speed to 100Mbps. When I connected from another jack or directly from the switch I got 1000Mbps