Responsive Table with Flip Does not work properly

Hello When I set the Table in Flip Mode
http://heimischevoegel.com/table-test/
, it flips but the Headings of the table are above the Table it looks like this

Heading1
Heading2
Heading3
Heading4
Column1 Column2 Column3 Column4
—– —– —– —–
—– —– —– —–
—– —– —– —–
—– —– —– —–
Scroll————————————–

It should look like this

Heading1 Column1 Column2 Column3 Column4
Heading2 —– —– —– —–
Heading3 —– —– —– —–
Heading4 —– —– —– —–
Scroll————————————————

It only happens in the responsive Mode but it has to look like this.

Here is a Link with a Test http://heimischevoegel.com/table-test/

Please need some help!
Best Regards

https://ww.wp.xz.cn/plugins/tablepress/