diff --git a/packages/squiggle-lang/__tests__/Distributions/AlgebraicShapeCombination_test.res b/packages/squiggle-lang/__tests__/Distributions/AlgebraicShapeCombination_test.res
index 702b67a4..552799ac 100644
--- a/packages/squiggle-lang/__tests__/Distributions/AlgebraicShapeCombination_test.res
+++ b/packages/squiggle-lang/__tests__/Distributions/AlgebraicShapeCombination_test.res
@@ -14,4 +14,16 @@ describe("Combining Continuous and Discrete Distributions", () => {
     ), // Multiply distribution by -1
     true,
   )
+  makeTest(
+    "keep order of xs when first number is discrete and adding",
+    AlgebraicShapeCombination.isOrdered(
+      AlgebraicShapeCombination.combineShapesContinuousDiscrete(
+        #Add,
+        {xs: [0., 1.], ys: [1., 1.]},
+        {xs: [1.], ys: [1.]},
+        ~discretePosition=First,
+      ),
+    ), // 1 + distribution
+    true,
+  )
 })
diff --git a/packages/squiggle-lang/package.json b/packages/squiggle-lang/package.json
index 85a90124..53453b1c 100644
--- a/packages/squiggle-lang/package.json
+++ b/packages/squiggle-lang/package.json
@@ -57,6 +57,7 @@
     "moduleserve": "^0.9.1",
     "nyc": "^15.1.0",
     "peggy": "^2.0.1",
+    "prettier": "^2.7.1",
     "reanalyze": "^2.23.0",
     "rescript-fast-check": "^1.1.1",
     "ts-jest": "^27.1.4",
diff --git a/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/AlgebraicShapeCombination.res b/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/AlgebraicShapeCombination.res
index a51de00d..2508e3df 100644
--- a/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/AlgebraicShapeCombination.res
+++ b/packages/squiggle-lang/src/rescript/Distributions/PointSetDist/AlgebraicShapeCombination.res
@@ -214,7 +214,7 @@ let combineShapesContinuousDiscrete = (
         // When this operation is flipped (like 1 - normal(5, 2)) then the
         // x axis coordinates would all come out the wrong order. So we need
         // to fill them out in the opposite direction
-        let index = discretePosition == First ? t1n - 1 - i : i
+        let index = discretePosition == First && op == #Subtract ? t1n - 1 - i : i
         Belt.Array.set(
           dxyShape,
           index,
diff --git a/yarn.lock b/yarn.lock
index 5f460cd2..ae8a6f60 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -4351,7 +4351,7 @@
   dependencies:
     "@types/react" "*"
 
-"@types/react@*", "@types/react@^18.0.9":
+"@types/react@*", "@types/react@^18.0.1", "@types/react@^18.0.9":
   version "18.0.14"
   resolved "https://registry.yarnpkg.com/@types/react/-/react-18.0.14.tgz#e016616ffff51dba01b04945610fe3671fdbe06d"
   integrity sha512-x4gGuASSiWmo0xjDLpm5mPb52syZHJx02VKbqUKdLmKtAwIh63XClGsiTI1K6DO5q7ox4xAsQrU+Gl3+gGXF9Q==
@@ -14635,7 +14635,7 @@ react-vega@^7.5.1:
     prop-types "^15.8.1"
     vega-embed "^6.5.1"
 
-react@^18.1.0:
+react@^18.0.0, react@^18.1.0:
   version "18.2.0"
   resolved "https://registry.yarnpkg.com/react/-/react-18.2.0.tgz#555bd98592883255fa00de14f1151a917b5d77d5"
   integrity sha512-/3IjMdb2L9QbBdWiW5e3P2/npwMBaU9mHCSCUzNln0ZCYbcfTsGbTJrU/kGemdH2IWmB2ioZ+zkxtmq6g09fGQ==