[Bug] series set itemStyle set colors have an offset.

### Version

6.0.0

### Link to Minimal Reproduction

https://echarts.apache.org/examples/zh/editor.html?c=bar-simple&code=PYBwLglsB2AEC8sDeAoWsAeBBDEDOAXMmurGAJ4gCmRA5AMYCGYVA5sAE7m0A0J6AE2aMiAbVoBZGL1i0AKgFcqM2gHUqAlXIAWClQDEOEFQGVmphdFoBdEgF8-6cjnxFUpMpRqyAbowA2SrT2jrB4VEZUhLCi_MQegsJiAIwATAAMPLAZmbDJAKy5ABy5AOy5yckVAMzp1qEeFNR0AEaMHLxx6BAsALYmFP7e7gno9MD-nHQAxPpFWACcWKXBo3Zx6-i2dgDcQA

### Steps to Reproduce

Open the example link：
https://echarts.apache.org/examples/zh/editor.html?c=bar-simple&code=PYBwLglsB2AEC8sDeAoWsAeBBDEDOAXMmurGAJ4gCmRA5AMYCGYVA5sAE7m0A0J6AE2aMiAbVoBZGL1i0AKgFcqM2gHUqAlXIAWClQDEOEFQGVmphdFoBdEgF8-6cjnxFUpMpRqyAbowA2SrT2jrB4VEZUhLCi_MQegsJiAIwATAAMPLAZmbDJAKy5ABy5AOy5yckVAMzp1qEeFNR0AEaMHLxx6BAsALYmFP7e7gno9MD-nHQAxPpFWACcWKXBo3Zx6-i2dgDcQA
The color I set is #F8A9A7，
The color I picked with the color picker is #ECACA9.

### Current Behavior

The color I set is #F8A9A7，
The color I picked with the color picker is #ECACA9.

### Expected Behavior

Ensure the set color matches the displayed color.

### Environment

```markdown
- OS:
- Browser:
- Framework:
```

### Any additional comments?

_No response_