Sforno on Numbers 9:20/ספורנו על במדבר ט׳:כ׳

1ויש אשר יהיה הענן ימים מספר, now the Torah reports the same matter for the third time as sometimes the encampment of the Jewish people was in an area which was pleasant, offered grazing for their animals and in spite of this after a day or two the cloud lifted, something which must have caused the people discontent [especially after the decree that the generation of the spies would die in the desert and they could not expect even if they moved to enter their ultimate destination. Ed.] Still, and this is why the Torah repeats the basic fact, the Israelites never complained about the movements of the cloud. Whatever the situation,

2על פי ה' יחנו, they journeyed in accordance with G’d’s instructions, regardless if it suited them or not.

3ועל פי ה' יסעו, even if the location of their camp had suited them very well.