I do not think this issue is normal, please do send us some info needed through this bug report guide so we could help report this issue to developers.
isn't it because of the device you are using? I mean some devices have automatic cache clearing function when app is closed which causes your ML app restarted after share to fb/ig
I will tell you tips when sharing something from this game.
When you want to share something, just press the social media icon, then press the back button to return to the game.
Your task will be completed without littering your social media timeline.
this game is so bad lots of bugs, but they don't care.