[Bug Report] 表格中存在fixed配置，在tab中切换时，表头会闪烁，表格内容会重叠。
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- Dominant language
- Vue
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Description
### Element UI version
2.15.14
### OS/Browsers version
win10，谷歌 144.0.7559.60
### Vue version
2.7.16
### Reproduction Link
https://codepen.io/wwongs/pen/XJKRbvm
### Steps to reproduce
1. 调整浏览器宽度，让table出现横向滚动条；
2. 快递切换tab
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