All mobs have significantly reduced coefficient on drop and spoil

Last two days I've noticed different values in drop and spoil on same monster - examples:

monster- Divinity manager, item on spoil - sealed vesper breastplate piece, 1st day spoil was - 55,54% 2nd day spoil is - 12,58%
monster- Satyr, item on spoil - steel, 1st day spoil was - 100%, 2nd day spoil is 90,35
monster- Doll Master, item on spoil - asofe, 1st day spoil was - 100%, 2nd day spoil is 52,95%
monster- Garden Guard Leader, item on spoil - asofe, 1st day spoil was - 100%, 2nd day spoil is 54,8%

monster Titan Spider - all items on spoil has significantly reduced coefficient.
link picture first day - https://servimg.com/view/20193652/13
link picture second day - https://servimg.com/view/20193652/14

the first picture with 33% ibug
and fix it

If picture with monster Titan Spider was bug, what about drop of other monsters that i described ???
What about all other monsters that have significantly reduced coefficient of drop and spoil ???