Synchronization issue with the app

The game statistics and the tactic rating of a friend of mine (screenname "Jonathan2012") don't update when he plays from mobile. When logged in via browser all seems fine.

Can anyone help with this one? Thanks in advance.

Similar to:
lichess.org/qa/4595/when-i-solve-puzzles-on-phone-there-is-no-change-of-number-of-played-puzzles-for-the-day-on-activity-tab-on-the-desktop
It seems that it is frequently seen problem.