I just noticed that total number of sentences playing is inflated when I add an existing sentence to a custom collection. For example, I have a collection called “persistent” for sentences whose clozes that I keep forgetting even after getting close to mastering. And when I add a sentence to that collection, total number of sentences played goes up even though in reality, I haven’t added any new sentence. I understand that custom collection sentences would be included in the total count when they are my own sentences that do not already exist in another collection. That is legit since they are different sentences. However, when the sentence already exists, adding it to a custom collection should not make the setence count twice.
I have tested it wtih “Favorites” collection, and adding it to the Favorites collection does not affect the total sentences count. It doesn’t really interfere with learning but I do wonder if this was intended to be this way.