diff --git a/contrib/gin-gonic/gin/gintrace_test.go b/contrib/gin-gonic/gin/gintrace_test.go
index c605938cae..c0079a61ff 100644
--- a/contrib/gin-gonic/gin/gintrace_test.go
+++ b/contrib/gin-gonic/gin/gintrace_test.go
@@ -649,6 +649,10 @@ func TestServiceName(t *testing.T) {
 // TestTracerStartedMultipleTimes tests a v2 regression where the global service name was being set to an empty string
 // when the tracer is started more than once.
 func TestTracerStartedMultipleTimes(t *testing.T) {
+	// tracer.WithService below overwrites the global service name, this call
+	// ensures we restore it its previous value after this test finishes.
+	testutils.SetGlobalServiceName(t, "")
+
 	tt1 := testtracer.Start(t)
 	defer tt1.Stop()
 	tt2 := testtracer.Start(t, testtracer.WithTracerStartOpts(tracer.WithService("global_service")))
diff --git a/contrib/log/slog/slog_test.go b/contrib/log/slog/slog_test.go
index a1cc95831a..cdfde838fa 100644
--- a/contrib/log/slog/slog_test.go
+++ b/contrib/log/slog/slog_test.go
@@ -84,6 +84,8 @@ func testLogger(t *testing.T, createLogger func(b io.Writer) *slog.Logger, asser
 	spanID := strconv.FormatUint(span.Context().SpanID(), 10)
 	if os.Getenv("DD_TRACE_128_BIT_TRACEID_LOGGING_ENABLED") == "false" {
 		// Re-initialize to account for race condition between setting env var in the test and reading it in the contrib
+		oldCfg := cfg
+		t.Cleanup(func() { cfg = oldCfg })
 		cfg = newConfig()
 		traceID = strconv.FormatUint(span.Context().TraceIDLower(), 10)
 	} else {
diff --git a/contrib/sirupsen/logrus/logrus_test.go b/contrib/sirupsen/logrus/logrus_test.go
index d20602abb8..cf682c6e04 100644
--- a/contrib/sirupsen/logrus/logrus_test.go
+++ b/contrib/sirupsen/logrus/logrus_test.go
@@ -36,6 +36,8 @@ func TestFire128BitDisabled(t *testing.T) {
 	t.Setenv("DD_TRACE_128_BIT_TRACEID_LOGGING_ENABLED", "false")
 
 	// Re-initialize to account for race condition between setting env var in the test and reading it in the contrib
+	oldCfg := cfg
+	t.Cleanup(func() { cfg = oldCfg })
 	cfg = newConfig()
 
 	tracer.Start()
diff --git a/scripts/ci_test_contrib.sh b/scripts/ci_test_contrib.sh
index d9ad0cdd2f..b85bd95379 100755
--- a/scripts/ci_test_contrib.sh
+++ b/scripts/ci_test_contrib.sh
@@ -42,7 +42,7 @@ for contrib in $CONTRIBS; do
     go get k8s.io/kube-openapi@v0.0.0-20250628140032-d90c4fd18f59
   fi
   go mod tidy
-  gotestsum --junitfile "${TEST_RESULTS}/gotestsum-report-$contrib_id.xml" -- ./... -v -race -coverprofile="coverage-$contrib_id.txt" -covermode=atomic
+  gotestsum --junitfile "${TEST_RESULTS}/gotestsum-report-$contrib_id.xml" -- ./... -v -race -coverprofile="coverage-$contrib_id.txt" -covermode=atomic --shuffle=on
   test_exit=$?
   [[ $test_exit -ne 0 ]] && report_error=1
   cd - > /dev/null || exit 1
@@ -58,7 +58,7 @@ for mod in $INSTRUMENTATION_SUBMODULES; do
     # When the issue is resolved, this line can be removed.
     go get k8s.io/kube-openapi@v0.0.0-20250628140032-d90c4fd18f59
   fi
-  gotestsum --junitfile "${TEST_RESULTS}/gotestsum-report-$mod_id.xml" -- ./... -v -race -coverprofile="coverage-$mod_id.txt" -covermode=atomic
+  gotestsum --junitfile "${TEST_RESULTS}/gotestsum-report-$mod_id.xml" -- ./... -v -race -coverprofile="coverage-$mod_id.txt" -covermode=atomic --shuffle=on
   test_exit=$?
   [[ $test_exit -ne 0 ]] && report_error=1
   cd - > /dev/null || exit 1