[Bug]当有一列是fixed时，table显示错位

[ivan403704409]

Element UI version

1.3.3

OS/Browsers version

mac os sierra/chrome 58.0.3029.110 (64-bit)

Vue version

2.3.3

Reproduction Link

https://jsfiddle.net/dqjsk1y2/

Steps to reproduce

https://jsfiddle.net/dqjsk1y2/

What is Expected?

表格每行都对齐

What is actually happening?

往下拉滚动条，到后面的数据，表格上下会有错位

[element-bot]

Hello, this issue has been closed because it does not conform to our issue requirements. Please submit issues with issue-generator. More info can be found in #3693.