thats a Client Side bug
the lub file setting is wrong
just edit the entrie for berserk potion in the stateiconinfo.lub
search for
StateIconList[EFST_IDs.EFST_ATTHASTE_POTION3] = { haveTimeLimit = 1, posTimeLimitStr = 1, descript = { {"Berserk Potion", COLOR_TITLE_BUFF}, {"%s", COLOR_TIME}, {"Increase ASPD"} }}
and replace with
StateIconList[EFST_IDs.EFST_ATTHASTE_POTION3] = { haveTimeLimit = 1, posTimeLimitStr = 2, descript = { {"Berserk Potion", COLOR_TITLE_BUFF}, {"%s", COLOR_TIME}, {"Increase ASPD"} }}
and all works fine