But with these settings, boxes with one and two items very often appear. Why?

"bradley_crate": {
"Enabled": true,
"Extra Items Min": 8,
"Extra Items Max": 8,
"Loot Multiplier": 3.0,
"Utilize Vanilla Loot Tables on Default Loot": true,
"Utilize Vanilla Loot Tables on Extra Loot": true,
"Utilize Random Rarity (depending on Items ALREADY in the container)": true,
"Rarity To Use (ONLY if 'Utilize Vanilla Loot Tables' is FALSE & 'Utilize Random Rarity' is FALSE | 0 = None, 1 = Common, 2 = Uncommon, 3 = Rare, 4 = Very Rare)": [
1,
2,
3,
4