The condition "random_chance" is supposed to take a value from 0.0-1.0, however it's requiring a lower decimal to perform as expected when there are multiple entries.

When specifying the condition:

"random_chance", "chance": 0.10

the loot from the entry is dropped nearly every single time. However this change to the "chance" decimal:

"random_chance","chance": 0.010

works out to a 10% chance to drop.  The more items you have as entries, the lower you need to have the chance decimal to work correctly.

Loot table where this happens attached. One with a few items that drop more often than 10% of the time, the other table with items where they are dropping constantly.