Praise be to Allah, and peace and blessings be upon the Messenger of Allah. To proceed:
It has been established that the deceased is shown his place in Paradise or Hell, and it is said to him:
“This is your place until Allah resurrects you on the Day of Resurrection.”
However, this vision does not mean that all the details of his fate have already been finalized. After death, a person continues to pass through the stages of the life of Barzakh, and then he will be resurrected on the Day of Resurrection for reckoning and recompense.
Likewise, seeing one's place in Paradise does not prevent a Muslim from experiencing punishment in the grave because of some of his sins, nor does it necessarily mean that he will not enter Hell if he has rights owed to others or sins that Allah has not forgiven.
The good deeds and sins a servant has may continue to affect his record after his death. His good deeds may continue because of ongoing charity, beneficial knowledge, and a righteous child, just as sins may continue to be recorded against him because of evil deeds that he left behind.
His good deeds may also be reduced because of the rights of other people, as mentioned in the hadith of the bankrupt person. The wronged people will take from his good deeds; if his good deeds are exhausted, some of their sins will be taken and placed upon him.
For this reason, the reckoning and the Scale on the Day of Resurrection serve to manifest the justice of Allah تعالى and to make clear what a servant has and what is against him, after which the final recompense takes place.
The Bridge is one of the stages of the Day of Resurrection. People will cross it according to their deeds. Some will cross it quickly, some will be slower, and some will be seized because of their deeds.
Knowing one's general fate in Barzakh does not necessarily mean that a person knows all the details of what will happen to him during every stage of the Day of Resurrection.
The terrors and hardships of the Day of Resurrection are among the greatest situations, and Allah تعالى may make what befalls a believer during them a means of expiating some of his sins.
Furthermore, each situation on the Day of Resurrection has its own terror. A person will be preoccupied with what he faces at that moment, to the extent that even the prophets عليهم السلام will say: “Myself, myself” in the context of intercession.
Seeing one's place in Paradise or Hell in Barzakh is not the final reckoning. Rather, it is an indication of the person's eventual fate, and it does not prevent him from passing through the other stages of the Day of Resurrection.
The gathering, reckoning, Scale, and Bridge have their own wisdoms and purposes, including manifesting the justice of Allah تعالى, holding people accountable for their deeds and obligations toward others, distinguishing the people of salvation from the people of destruction, and then bringing matters to their final and eternal recompense.
Therefore, there is no contradiction between what a person sees in his grave and what he experiences on the Day of Resurrection.
And Allah knows best.