Corel Draw automatically locking nodes of manually created svg document

Hello there, I have some strange issue: there are some .svg graphs which I created manually in my web app. It's not really complicated graphs with a lot of nested objects (link below).
And when I'm importing these graphs to CorelDraw some nested elements auto-locked and idk why. At the same time, if import these graphs to Inkscape then all works perfectly - nothing locked. I tried to find some patterns in code (in my code and in XML code of these graphs) which could lead to this strange problem, but I found nothing. 

Can somebody please explain me, why CorelDraw locking some of nested groups of objects in these .svg files? 


examples.zip