diff --git a/slime/rollout/sglang_rollout.py b/slime/rollout/sglang_rollout.py
index 9dcf5fce85..7190ab9f20 100644
--- a/slime/rollout/sglang_rollout.py
+++ b/slime/rollout/sglang_rollout.py
@@ -391,6 +391,10 @@ async def generate_rollout_async(
 
     state = GenerateState(args)
 
+    # GenerateState is a singleton; submit_generate_tasks dispatches with self.args, so refresh per
+    # call — otherwise a prior rollout's args (e.g. eval's group_rm=False) leak into the next one.
+    state.args = args
+
     # instantiate data filters
     dynamic_filter = (
         load_function(args.dynamic_sampling_filter_path) if args.dynamic_sampling_filter_path is not None else None