If you have registered on the Main Site where you run the tests, your speed test results get saved and you can provide us with links to them. Like this
It would be much easier to diagnose what problems you may have from those and you learn by experience, rather than any of us attempt to describe the various meanings of different results hypothetically like in a classroom.
The two different results are partly explained below the Start screen of the speed test. This paragraph
The speedtester connects to TCP port 8095 using a custom protocol and also uses HTTP protocol over TCP port 80. Please ensure these ports are not blocked by firewalls.
The first one uses a single stream on that special port with a special protocol. The second uses six simultaneous streams using HTTP on the normal Port 80.
My graph above is almost perfect. Seeing your graph(s) we may be able to give some idea of where the problem lies.
My broadband basic info/help site - www.robertos.me.uk
| Domains,site and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 57.2/15.3Mbps @ 600m. - IPv4BQM
"Angels can fly because they can take themselves lightly."
- G K Chesterton.