Repetitive notification about items being added and converted

I keep getting this message - it’s been for weeks now - on my iPhone, popping up in a small square overlay every few minutes while I’m using DTTG.

49 items added and converted

I use CloudKit sync mostly, mixed with a little Bonjour. The database sync is set to download everything fully. It always says 49 items, so I’m assuming it’s the same items each time triggering this.

Are there any ideas what may be causing this, or how to resolve it? It seems to be on the annoying rather than destructive end, which I’m very glad about.