Dark Crystals Creating Negative Stat Items?

IIRC, the amount the stats are affected by the Dark Crystals is different for every stat.

look the original stats of overall are:

STR +5, DEX +1, HP +10, DEF 65

the overall on image has those stats:

STR +3, DEX +0, HP +8, DEF 65

we know that Basic Dark Crystal can range to -1 ~2 | 0 | +1 ~2

so he lost 2 STR, 1 ~2 Dex, 2 HP and can be lost 1 ~2 DEF what he got back using a DEF scroll (100% (+1) or 60% (+2 def)).

at least on my point of view, this is what happened... , so theres 2 possibilitys:

since he lost 1 ~2 dex , what could be 2, the item turned into a negative stats, -1 DEX what he got back from 100% scroll.

or, the guy just used a DEF scroll and is not telling the true...

a SS of the clean overall would clear the things