Powerline adapters are very dependent on the quality and condition of the hosting electrical circuit(s).
Are you sure that both outlets are on the same circuit?
Is it possible to test the powerline adapters across a different circuit?
What else is plugged into the circuit or circuits?
Are the outlets in good condition, with all wire connections properly connected and secure. If you do not know how to check and test then get an certified/licensed electrician to check outlets, wiring, breakers, etc..
And be sure to verify that known working (at speed) Ethernet cables are being used between the powerline adapter and its' supported network device.
I'll answer this in reserve order.
I checked 4 different ethernet cables and found the one with more consistent and higher numbers with different devices. This is the only thing I knew how to accurately do.
When I moved into this house they replaced some of the wiring because they were in poor condition but I'm not sure if they repaired the whole system. From the outside they look like any other outlet and no longer flip the breaker every time you turn on a TV. I'm thinking this is probably my problem, the wiring is still trashed in other parts of the home. Which is good to know this would cause issues. I wasn't sure how it would affect which is why I asked.
Connected to this circuit currently, though my home troubleshooting problem, there are only a few monitors, 2 pcs, router and monitor, and a lamp. And nothing is plugged into the outlet on the adapter.
I am only slightly sure they are on the same circuit, because i'm not 100% sure how to check they. They are on the same breaker at least.
Overall, thanks for the answer. I'll look into a new company to check my wiring. I appreciate the answer.