Custom playlist problem

I have had this problem since March 2024. When I create a playlist (for example, top 50 for March 2024), only 44 songs are added to it. The other 6 just disappear. I tried to do this with other months (April, May, June etc.) and there were always a few songs that were not added (only 45, 47, for example). At the same time, there are other problems, such as odd photos on songs from playlists instead of albums and counting listening to several songs as one. Because of this, I have to manually fix playlists because they don't represent reality.