sonos can not remember mofibo story position

Hi
my kids listen a lot Mofibo on Sonos. The sounds is very good

However, you start one story on one speaker (1) and then starts an other story one speaker (2). And then stop both stories, System is not able to remember where you stopped the story. This means that the story restart on both speakers. It used to work but it don’t work anymore. It is pretty annoying when the story is several hours long.

have anyone experienced the same issue?
does one maybe know a work around?