Housewrap is a great way to reduce air leakage and prevent water from entering the wall system. Keeping water that infiltrates exterior cladding from the wall system helps to mitigate rot and mold. Unfortunately, workers sometimes install housewrap incorrectly and this not only allows moisture in, but it also prevents water from getting out. When you reverse the lap, water flowing down the surface of the top layer of wrap flows behind the wrap below where it gets trapped between the sheathing and the housewrap and that can lead to unwanted and costly issues.
Instead, ensure that upper house wrap is not tucked behind lower wrap, but that the bottom edge laps over the lower wrap. Check that housewrap is correctly installed before it gets covered up. It’s an expensive mistake to have to correct after the fact.