Reset Valor my 4th and 5th time yesterday. Didn't Count
I have videos and screenshots of myself resetting my valor and the triumph not updating from 3/5 to 4/5 the first time, then the triumph updating the second time from 3/5 to 4/5. It should be updated to 5/5 so that I can finish the triumph for the Redrix quest. Let me know if you need to see the videos. both resets happened in the last 48 hours.
The triumph tracks the most resets in any single season. By your description you had 3 resets as max from a previous season that is why it did not increase until your 4th reset. Your total points show you are at your 4th reset for season 6
S6 Valor: Guardian