diff --git a/openapi-model/src/main/scala/sttp/apispec/openapi/validation/OpenAPIComparator.scala b/openapi-model/src/main/scala/sttp/apispec/openapi/validation/OpenAPIComparator.scala
index ee98a39..c399a34 100644
--- a/openapi-model/src/main/scala/sttp/apispec/openapi/validation/OpenAPIComparator.scala
+++ b/openapi-model/src/main/scala/sttp/apispec/openapi/validation/OpenAPIComparator.scala
@@ -64,8 +64,8 @@ class OpenAPIComparator(
 
   private def checkOperation(
       httpMethod: String,
-      readerOperation: Operation,
-      writerOperation: Operation
+      writerOperation: Operation,
+      readerOperation: Operation
   ): Option[IncompatibleOperation] = {
     val readerParameters = getOperationParameters(readerOperation)
     val writerParameters = getOperationParameters(writerOperation)
@@ -104,7 +104,7 @@ class OpenAPIComparator(
       Some(IncompatibleOperation(httpMethod, issues))
   }
 
-  private def checkParameter(readerParameter: Parameter, writerParameter: Parameter): Option[IncompatibleParameter] = {
+  private def checkParameter(writerParameter: Parameter, readerParameter: Parameter): Option[IncompatibleParameter] = {
     val isCompatibleStyle = readerParameter.style == writerParameter.style
     val isCompatibleExplode = readerParameter.explode == writerParameter.explode
     val isCompatibleAllowEmptyValue = readerParameter.allowEmptyValue == writerParameter.allowEmptyValue
@@ -125,8 +125,8 @@ class OpenAPIComparator(
   }
 
   private def checkContent(
-      readerContent: ListMap[String, MediaType],
-      writerContent: ListMap[String, MediaType]
+      writerContent: ListMap[String, MediaType],
+      readerContent: ListMap[String, MediaType]
   ): Option[IncompatibleContent] = {
     val issues = writerContent.flatMap { case (writerMediaType, writerMediaTypeDescription) =>
       val readerMediaTypeDescription = readerContent.get(writerMediaType)
@@ -157,8 +157,8 @@ class OpenAPIComparator(
   }
 
   private def checkSchema(
-      readerSchema: Option[SchemaLike],
-      writerSchema: Option[SchemaLike]
+      writerSchema: Option[SchemaLike],
+      readerSchema: Option[SchemaLike]
   ): Option[OpenAPICompatibilityIssue] = {
     (readerSchema, writerSchema) match {
       case (Some(readerSchema: Schema), Some(writerSchema: Schema)) =>