The revenue and net profit of wholly-owned subsidiaries are more than half of the data in the consolidated statements of the parent company. What happened? What could be the reason?

There is a related party transaction between the parent company and the subsidiary company, and the goods produced by this transaction are not sold to the outside world.

Probably because the subsidiary sells goods to the parent company, when the financial report comes out, the goods are still on sale. In this case, the profit on the single statement of the subsidiary will be higher than that on the consolidated statement, because the profit on internal transactions on the consolidated statement will be offset.