If you joined recently you will be on the 76/19.5Mbps product speed capped to 40Mbps by Plusnet. Your sync looks to be around 60Mbps, so it thinks you are underperforming.
If you run the BT Wholesale Performance Test and go to Further diagnostics
from the initial results page, what is your downstream IP Profile?
My broadband basic info/help site - www.robertos.me.uk
| Domains,site and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 57.2/15.0Mbps @ 600m. - IPv4BQM
"Angels can fly because they can take themselves lightly."
- G K Chesterton.