That is odd.

Here is a copy of the parameters for promotion and medals from my GWX 3.0 basic.cfg file for comparison.
[PLAYER_RENOWN]
AcademyBonus=1000
RankLevel0=0; SCORE
RankLevel1=1499; SCORE
RankLevel2=7999; SCORE
RankLevel3=14999; SCORE
MedalSettings0=0.25
MedalSettings1=0.5
MedalSettings2=1
MedalScore0=3000;2 class, SCORE
MedalScore1=7000;1 class, SCORE
MedalScore2=15000; knight, SCORE
MedalScore3=25000; oak leaves, SCORE
MedalScore4=37000;swords, SCORE
MedalScore5=50000;diamonds, SCORE
MedalScore6=80000;all, SCORE
You didn't say if you are using GWX 3.0 with SH3 commander but, if you are, there is a file needed for SH3 Commander to make them work properly together. It is named GWX3_CFG_for_SH3Commanders.