no i'm on stable, never used weeklyDon't update System apps from other sources, they may not be compatible and something may not work
Also, if you switched from Weekly, you had to do Factory reset
I also have Lisa, that last Stable and my Gallery correctly shows All (photos, screenshots, Whatsapp) or just Camera, sorted pay days, for Today, Yesterday, etc - screenshot attached
You can try: Settings, Apps, Manage apps, , find Gallery and delete Data (it should not delete your ohotos but the Gallery database - it will have to rebuild the database)
unfortunately you can't delete data of gallery, just cache, I had already thought about it, your screenshot also confirms it
I'm not speechless as I never had this issue, only after last update it turned up