• I have searched the issues of this repository and believe that this is not a duplicate.

Reproduction link

Steps to reproduce

1.点击Chines Score，使该列处于可排序状态
2.横向滚动表格内容，使Math Score内容处于固定列Chinese Score的背后

What is expected?

Math Score内容被固定列遮挡

What is actually happening?

td.ant-table-column-sort {
    background: rgba(0, 0, 0, 0.01);
}

这段代码导致fixed column背景透出，Math Score内容被看到