Albums streams/minutes “restarting”

I have noticed in the past few weeks that there are some albums that have kind of “restarted” their minutes/streams count some time ago. For example the album heaven or last vegas is one of my most streamed albums ever with over 1000 minutes however it disappeared from my top albums and started the count from zero, even though when I look at my most streamed songs from that band - I see that the songs from that albums are still at top. Another example is Dummy by portishead