adding new songs and not showing

[eserkelleci]

Plan

Free

Country

 Turkey

Device

Notebook

Operating System

Windows 10

My Question or Issue

when add some songs to a list, the not showing them and when adding again it says already added and new ones will be duplicate. even i add them as duplicates they also dont show again.

For my example i tried to add all "disturbed - evolution (deluxe)" album to my playlist. and it shows only one song.