[Bug]: KV pool accuracy issues

[baxingpiaochong]

Your current environment

The output of `python collect_env.py`

vllm-ascend 0.11.0

🐛 Describe the bug

A2 2p1d p:tp16 d:ep32 After executing the GSM8K precision test dataset twice, the second precision score is abnormal.

[LCAIZJ]

cc @fems14 @Pz1116

[Pz1116]

Which model are you using? Is prefix cache enabled?

[baxingpiaochong]

Which model are you using? Is prefix cache enabled?

deepseek r1. no-enable-preifix