diff --git a/src/RepairGUIAdv/geomrepairadv_common.py b/src/RepairGUIAdv/geomrepairadv_common.py
index 83c93379d..7ecc59c41 100644
--- a/src/RepairGUIAdv/geomrepairadv_common.py
+++ b/src/RepairGUIAdv/geomrepairadv_common.py
@@ -60,6 +60,8 @@ class DlgRef_1Spin_QTD(Ui_DlgRef_1Spin_QTD, QWidget):
         self.setupUi(self)
 
         self.TextLabel1.setText(title)
-        self.SpinBox_DX.setValue(default_value)
+        # Setting deciamals must be in the first place, because from QDoubleSpinBox docs:
+        # the maximum, minimum and value might change as a result of changing this property.
         self.SpinBox_DX.setDecimals(decimals)
         self.SpinBox_DX.setMaximum(max_value)
+        self.SpinBox_DX.setValue(default_value)