kidsXmlFile expand/collapse

I am having issue with kidsXmlFile with only one childnode.
When I click on a row which has only one child row, clicking + will expand the child row correctly, but then clicking – will NEVER collapse the node.
It is collapsing, but it is calling it again to expand.
OpenEndHandler is called twice.
(This only happens with a node with ONE child row)
Does anybody know how to solve this?

Unfortunately we cannot reproduce this issue locally. Please open ticket at support.dhtmlx.com/ and provide complete demo where we can reproduce this issue.