What did Yaravam hear, and when?
Radak: Before he returned, he heard that they called for him to come, and he came.
'Rashi' (Divrei ha'Yamim II, 10:2), Malbim: When he was in Egypt, he heard that they were going to Shechem to make Rechav'am king.
Here it says that they called to Yaravam while he was in Egypt. In Divrei ha'Yamim II, 10:2 it says that they called to him after he returned from Egypt!
Malbim: Both are true. When he first heard, he did not return from Egypt, for he did not know the situation. He thought that they are coming to declare him king and strengthen his kingship; he stayed in Egypt. Then they sent and called for him to return from Egypt, like it says here (verse 3). Surely they informed him what was in their hearts! There it does not mention that they called to him after he returned; it is concise about Malchei Yisrael.
