There's no evidence that they were even there as commonly told, and of interest are Egyptian records which are very detailed and which omit their presence / exodus.
You are aware that Egyptian records were kept by pharaonic officials who had an interest in propagating propaganda that cast their pharaoh in the best possible light? The battle of Kadesh, for instance, was cast as a victory by King Rameses II over the Hittites when in actuality it was closer to a draw. If the Egyptians were bested in battle by a group of runaway Hebrew slaves, what incentive would they have in keeping a record of it?
