On my scout I noticed that the dex stat was displayed in red as would be the case with a debuff present or con loss after a death.
Looked into it and found the culprit:
If items with acuity cap are equipped they get added to the dex cap and afterwards subtracted again.
Left: item equipped (boots with 8 acu cap)
Right: item not equipped.
The 8 acuity cap is added to the base dex, raising the possible dex from items to 54 from 46. Then that cap is subtracted again (-8 debuff value) with a result of 165 dex.
The red number can only be seen when unbuffed, buffed this value gets subtracted from the buff value.
This makes on-the-fly stat evaluation a little mind-boggling if you happen to have a ROG with acu cap or an acuity cap item with no class restriction.
A possible solution would be to not add acu cap to scout at all or to an actual acuity stat so it's not "in the way".