Pokémon Sleep has resolved a display bug affecting several screens, including “A New Week,” “Moving sites,” Cyan Beach (Expert) and Expert bonuses, following a server update. The issue occurred only under certain conditions and did not affect game progression. Separately, Pokémon Sleep is still experiencing an issue involving Munchlax’s Nap Island and the “Take Pokémon Back” feature when a Pokémon reaches Lv. 70, causing the game to stop progressing. Players affected by the Lv. 70 bug can restart the app to continue playing, while a permanent fix is planned for a future update.
Source: Official Pokémon Sleep news