multiple items cannot be selected using eui-checklist widget

[hank123]

I am trying to have multiple checkbox so that multiple items can be selected, I use euiChecklist according to the demo, according to the documentation
"euiChecklist
A widget designed to expose facets on a collection of related values (multiple items can be selected)
Example (using widget directive):
"

but, the problem is that when I select one checkbox item, all the other checkbox disappeared. let me know if the documentation is wrong, I know that I can make multiple box selection available by using eui-aggregation with eui-filter-self="false".

Thank you !

Hank123