ZBrushCentral

HELP - error in zbrush

Good morning!
I’m havingaproblem withmy modelsinZbrush. For example: I’m modelinga faceand start todo thedetail inonearea.I realizethat itis low onpolygons, soI separatethis area andclick on EDGELOOP to putmore polygons. The problembegan whenincreasingthe levelof division. Here is apicture of whathappens.Someoneknowsme explain whythishappens?
thank you

i have had this happen dont really remember the cure but a start is make sure the points hidden are deleted (in the geometry menu)
also try make polymesh before retopo and the point left behind when you click edit topo is alt clicked (too delete).??