Greatest London Flat distance wrong

Hi, I used the course for both my Friday TFC Races (EU & UK) and several riders from both events advised that when they reached the finish barrier the course distance still showed 1.2 Km, several riders carried on but it didn’t finish when the distance reached zero. The Zwiftpower results look good but it did affect riders who were not sure of the course and were still waiting to wind up their sprint.
ZwiftPower - The Friday Criterium Summer Races (With Category Enforcement)
ZwiftPower - The Friday Criterium Summer Races (With Category Enforcement)
Any ideas on why this happened.
Alan