Can’t able to add new section in between post after this update

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I was able to add a section after I write my heading in WordPress editor and then I use nimble to add content but after this update, nothing is working out. I write my heading in WordPress editor then I come to nimble to add section I can’t able to add. My heading goes down to the bottom of the page rather than creating a new section in itself. Now it is only showing new section at the top and at the bottom which is totally not relevant to my post. I want to add a section inside my post pls help me out with this.

p.s. : Check the link. hope you find it useful THANK YOU.