[Bug] [Module Name] Bug title Graph is not normal，Appear in large numbers none header chunk

[su400]

Search before asking

• I had searched in the issues and found no similar issues.

Operating system information

Linux

Python version information

3.10

DB-GPT version

main

Related scenes

• Chat Data
• Chat Excel
• Chat DB
• Chat Knowledge
• Model Management
• Dashboard
• Plugins

Installation Information

• Installation From Source

• Docker Installation

• Docker Compose Installation

• Cluster Installation

• AutoDL Image

• Other

Device information

4gpu ,A6000

Models information

llm:qwen2.5 72B
BGE-M3

What happened

生成的图谱不正常，出现大量none header chunk,检索问答时仅有极少数回答是正确的，大量的报错。

What you expected to happen

不知道

How to reproduce

导入同样的文件

Additional context

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

[Aries-ckt]

You can check your prompt log and check are there some graph nodes recalled by graph retrieve.
Now graph retrieve process is

1. keyword extract from query
2. Accurately match graph nodes based on keywords and find node information associated with graph nodes.
3. Assembling context to form prompt word module