Geometry bug

[system]

This is really bugging me and hopefully someone knows what is going on. I tried searching, but I couldn’t figure out what keywords would give me similar topics.

This is only my second day in zbrush so maybe I did something to cause this. My base mesh had geometry where it seems to have disappeared. I am hoping there is an easy fix or at least an explanation as to why this occurred.

If I hide all it causes that stretched geometry and if I select just the mask and do delete hidden it causes geometry to disappear from the higher subdiv levels.

Obviously retopologizing fixes this but I really don’t feel the need to do that right now since the topology should be fine.

EDIT: Figured it out, somehow I managed to mask just a tad bit before I moved the model. Still doesn’t really explain how the highpoly is smooth but I have fixed the issue.

Current high sub division level: 

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