Nodes overlapping issue

[system64MC]

Hi! I have the following issue:

The content of the node behind another one is still displayed.
What I do is enclosing my input pins into a child, then doing ImGUI::nextLine(), then enclosing my controls in another child, then doing NextLine() again and finally, I enclose my output pins into another child.

How can I fix this please?
Thanks for your help!