diff --git a/python/sglang/srt/disaggregation/mooncake/conn.py b/python/sglang/srt/disaggregation/mooncake/conn.py
index 4f89f7097..15e815e69 100644
--- a/python/sglang/srt/disaggregation/mooncake/conn.py
+++ b/python/sglang/srt/disaggregation/mooncake/conn.py
@@ -726,7 +726,9 @@ class MooncakeKVManager(CommonKVManager):
                 # Each prefill sends all its dims to the appropriate offset in decode
                 src_dim_start = 0
                 num_dims_to_send = src_dim
-                dst_dim_start = local_tp_rank_in_group * src_dim
+                writers_per_decode = self.attn_tp_size // dst_attn_tp_size
+                local_writer_idx = local_tp_rank_in_group % writers_per_decode
+                dst_dim_start = local_writer_idx * src_dim
             else:
                 # 1 prefill rank sends to multiple decode ranks
                 # Prefill sends a slice of its dims to each decode rank