Expected Behavior:

When I am adding items in repeater (for example slides in slider) it should give me new field with empty fields (like slide title, url, image).

Actual Behavior:

Instead, it takes some of the values from previous slide.

This happens with CUSTOM fields (individually built fields for CMB2) and there is no identificator (ID for the new field which we could use for workaround - whole field object is being duplicated.

Steps to reproduce (I have confirmed I can reproduce this issue on the trunk branch):

1. Create some custom field for CMB2
2. Use that field in Repeatable Group
3. Try adding items in this group

CMB2 Field Registration Code:

You could use exactly these examples - https://github.com/WebDevStudios/CMB2/wiki/Adding-your-own-field-types