1)
Why, in Pasuk 25, did the B'nei Gad and Reuven say "Ka'asher Adoni Metzaveh" and now switch to "Eis asher Tzivah Hashem"?
1.
Ramban: They were telling Moshe that it was unnecessary to make a two-sided stipulation , since his word was the word of Hashem. and that they would not dream of violating it.