Sotrage node API: storageDaily.atRestTotal updates rarely and sometimes gives weird values

I want to have a graph of how much data is stored by each satellite. To do that, I thought to use the storageDaily.atRestTotal value for “today” and just divide it (get GBh/h, which would be GB). However, the node seems to update that value twice per day. Here is a graph of the unprocessed value queried every 5 minutes:

It seems to have behaved properly for a while and then went back to this. Is this intentional or some kind of bug?