Ajouts recents smart playlist

Hello, i have noticed, sine a few versions, the default smart playlist « ajouts recents », does not work properly.
It seems to misinterpret the field « date added ». It sometimes shows me the truely recent adds’ but after a couple of hours, it replaces them with tracks recently PLAYED and also random tracks.
Any idea where this could originate? I use a synology NAS With raid 1 config on 2 hdds