TreeView Child Disappears when I select them again in select

[Shahraiz]

I have simple tree view i used it to select items from treeview it woks perfectly when I select parent item but

when I select child item . Next time child item disappears.
Anyway how to fix this problem

[Marin Bratanov]

You should edit your post to include a code sample that showcases the problem, right now it is quite a guess to know what is happening.

[Shahraiz]

See added two images

I am using simple selection of tree view in Telerik window

when I click on it it selects value 1st time 2nd time it removes child value see site.psd is gone now in window . i want tree values to stay same child value if i select one time they are gone 

[Shahraiz]

Let me share link this is very strange behaviour 
https://blazorrepl.telerik.com/QlPkmZca348bSsbv51

when you select child 2nd items

[Shahraiz]

Finally I solved it I was not using retrieving values properly.