diff --git a/datalab/gui/docks.py b/datalab/gui/docks.py
index 1c523ca2..5d2076f0 100644
--- a/datalab/gui/docks.py
+++ b/datalab/gui/docks.py
@@ -94,8 +94,8 @@ def set_labelfuncs(cls, statstool: CurveStatsTool) -> None:
             )
         else:  # YRangeCursorTool
             labelfuncs = (
-                ("%g < y < %g", lambda ymin, ymax: (ymin, ymax)),
-                ("∆y=%g", lambda ymin, ymax: ymax - ymin),
+                ("%g < y < %g", lambda ymin, ymax: (min(ymin, ymax), max(ymin, ymax))),
+                ("∆y=%g", lambda ymin, ymax: abs(ymax - ymin)),
             )
         statstool.set_labelfuncs(labelfuncs)