[Bug]: 多个讨论的时候，白板重叠了
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bug
- Dominant language
- TypeScript
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Description
### Bug Description
### Steps to Reproduce
https://open.maic.chat/classroom/mAOfev6sDb
### Expected Behavior
希望不重叠，显示正常即可。
### Actual Behavior
重叠了
### Deployment Method
Other
### Browser
_No response_
### Operating System
_No response_
### Relevant Logs / Screenshots
```shell
```
### Additional Context
_No response_
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Assessment
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