[Bug Report] Header jumping when scrolling

### 选择要提交 issue 的库
vue-easytable

### Issue 类型
Bug

### Issue 标题
Header jumping when scrolling

### 仓库版本
v2.25.0

### Vue 版本
2.6.14

### 浏览器
Chrome 111.0.5563.146

### 系统类型
macOs

### 重现链接
https://5supfz.csb.app/

### 重现步骤
scroll up in small lines

### 期望的结果是什么？
header to be in one's place

### 实际的结果是什么？
header jump down and back

### 补充说明（可选）
I add red background for header, now you can see better what is hapenning.
Also record a video with bug -
https://www.dropbox.com/s/guubvts25xyf9jl/%D0%97%D0%B0%D0%BF%D0%B8%D1%81%20%D0%B5%D0%BA%D1%80%D0%B0%D0%BD%D0%B0%202023-04-06%20%D0%BE%2011.51.39.mov?dl=0