lvl 100 pets exp gain

ok guys i have finally maxed the lvl of 2 of my pets 
pulis lvl 100
and colon lvl 100

now what i find weird is whenever i feed them with fpf 
they no longer earn exp on all stats

for example today with my colon ..after i feed him fpf he only earned exp on agi
for reference heres my colons stat at lvl 100
str  136   -   100 blue / 36 red
int    55   -    5 blue / 50 red
vit   222  -   150 blue / 72 red
agi  101  -   50 blue / 51 red
dex 105  -   70 blue / 35 red
crt     63  -   25 blue / 38 red

so is the stat gain after hitting lvl 100 is minimized or is it something else.... kinda annoying since i was trying to boost the stats to at least all 100