ill share my personal experience ,IRCC wanted a clarification about a change in the address and an additional document that i forgot to send ,they didnt return my application but asked me to send a clarification and the additional document , four month after i received an email saying check the portal for an update ,i did and the portal status was returned application and next to each and every form ...even the payment incomplete without any further explanation ( nor did i receive a letter explaining the why )3 days after that i checked the portal the status was back to submitted ... could be one of those weird exceptions , the best thing to do is make sure to follow the guide check mall the details before you send it ...and be patient