From 7bdb98c94697d096070b158dabb4582d9e9fb57e Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Mon, 26 Feb 2018 15:02:19 -0600
Subject: [PATCH] Fix #9826. Solution by @gloomyandy

---
 Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
index f11d06077..fe2fa14ad 100644
--- a/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
+++ b/Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp
@@ -1668,7 +1668,7 @@
             }
           #endif
 
-          z_values[i][j] += z_tmp - lsf_results.D;
+          z_values[i][j] = z_tmp - lsf_results.D;
         }
       }