🤔 [QUESTION]双轴图中使用双柱状图重叠

### 🐛 Question description [Please make everyone to understand it]
在参考G2Plot双轴图时，如果使用两个柱状图，柱状图会出现重叠的情况，请问有什么好的解决办法吗？

### 💻 Link to minimal reproduction
https://g2plot.antv.antgroup.com/examples/dual-axes/grouped-column-line/#grouped-column-line

* **G2Plot Version**:
* **Platform**:

Start by reproducing the overlap in the linked G2Plot grouped-column-line example and inspect its dual-axis configuration. The issue names no source files or tests, so trace the example's chart setup before determining the relevant implementation area. Done means identifying and documenting a verified way for the two column series to render without overlap.

Written by the indexing model from the issue text.