Contradiction with Exodus 14:2
Numbers 33:7 states the Israelites pitched in Etham on the edge of the wilderness, while Exodus 14:2 indicates they turned back and encamped before Pi-hahiroth, between Migdol and the sea, which may appear different in terms of their journey movement and sequence.
Exodus 14:2: Speak unto the children of Israel, that they turn and encamp before Pihahiroth, between Migdol and the sea, over against Baalzephon: before it shall ye encamp by the sea.