i cant fix this but i can tell u how to prevent it it only happens in privates servers because we r not nexon or asiasoft we CANNOT run out PS on a high RAM comp so to prevent negative exp from happening is to look at if u have 99.98% exp and u have more exp that u need its like a glitch i ddi it once but i was killing dragons at entrance to dragons at lvl 70 and i had genesis and i had like 30mil exp when i needed only 1 mil so i went to HHG1 and killed snails and got to lvl 119 and this happens alot if u get an oerload it'll lvl u like alot of lvls and this happens when u kill bosses expecially zakum and horntail too fast cause they have more than 1 part of their body so if there is a no ksing rule just kill a zakum arm and w8 2min if it dosnt take u 2min to kill it
so botom line kill every part of zakum in 2min or more if u kill in 1 min w8 for 1min
for horntail i htink its more like 5-10 min if u disobey the times u will turn out with negatve ext