It looks like the mesh or UV’s got messed up in Zbrush
But–I recommend not using Zbrush to texture it that way, 3ds Max actually has a better texturing tool built in called Viewport Canvas where you can paint directly to the mesh in 3D and it’s very similar to how you would work in Photoshop:
http://help.autodesk.com/view/3DSMAX/2017/ENU/?guid=GUID-F5518487-A253-44F0-A8D9-9CB537A8F392