There is no chance of rejection after ppr, the only reason why your passport is returned without stamp is wrong photo specifications, or medical expired etc etc.
When you passport is stamped with one time entry immigrant visa, your gckey would change to Approved from Submitted. You would be able to see your visa details in gckey - details like counterfoil number, expiry date etc.
The other portal status is also correct, since you have received ppr, it will say that decision has been made about your application and you have been asked to submit your passport.
You are overthinking
, just keep an eye on sms you would receive from vfs once passport is returned from IRCC. post that, within few hours your gckey status should turn into Approved.
Best luck!