This version update reduced the base damage of many of the Skirmish+1 weapons, and this is reflected in the Japanese help text, but not in the English help text.
For example:
Leisilonu +1 (Dagger)
DMG:86 Delay:183 Evasion+15 Dagger skill +162 Parrying skill +162
LV 99 THF BRD DNC
Is how this weapon displays in the English client, however the Japanese help text reflects that the base damage has been reduced to 75.
Iztaasu +1 (Sword)
DMG:99 Delay:236 Sword skill +162 Parrying skill +162
LV 99 RDM PLD BLU
In the Japanese help text, the reduction in base damage to 97 is reflected.
There are a few weapons whose base damage was increased, however. This is also not reflected in the English client.
You should really adjust this posthaste and openly, as it can be rather expensive to get upgrade items from Yorcia Weald and these base damage changes are in some cases intense enough to tip the scales in the favor of other options and seeing the incorrect damage value, someone might end up wasting their time and they'll be very disappointed if the fix is done covertly next update.