multiple loopfields’ +button don’t work properly

If you use multiple loop fields and use the button as an additional loop field from the second loop field, you get the first group of loop fields.

It is the same symptom as the following person.
multiple loopfields’ +button don’t work properly
https://ww.wp.xz.cn/support/topic/multiple-loopfields-button-dont-work-properly/

This has occurred since the update　2.5.16.

The “Add” button works correctly, soI’m hiding the “+” button that causes the problem.