virus scan /full scan issue??

Laptop windows 10 Operating System Norton Internet Security v 22.9.1.12 When I logged on the other day, the Norton icon in the bottom table of the screen had “orange !” and when I checked status, Message said that the laptop needed to be scanned for viruses ( I think it had been a week since last scan). Ran full scan which completed ( green writing) and showed no issues. However the “orange !” did not change to green check mark on Norton icon. I waited about 5 minutes and it still didn’t change. Perplexed I went and ran a quick scan. When the quick scan completed, the “orange !” changed to a green check mark immediately upon completion. So perplexed as to why after the clean full system scan the green check mark didn’t immediately appear?? Anyone see this happen before? Is it a sign of a major problem?