6 of your flights were done as a blue, 2 as a bronze.

For some reason the "flights completed" counter resets and only counts those in your current tier. It's a bug, but one that can be ignored with complete confidence.

(It used to be that your tier points would reset after getting silver - there was no bronze back then - so you'd need to get 2,100 points to get gold from blue, but only 1,500 from silver in the second year etc. That changed about six years ago and I assume it's a hangover from then...)