Element picker find twice body on website

[krystian3w]

Prerequisites

• I verified that this is not a filter issue
  • Filter issues MUST be reported at filter issue tracker
• This is not a support issue or a question
  • Support issues and questions are handled at /r/uBlockOrigin
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
  • Your issue may already be reported.
• I tried to reproduce the issue when...
  • uBlock Origin is the only extension
  • uBlock Origin with default lists/settings
  • using a new, unmodified browser profile
• I am running the latest version of uBlock Origin
• I checked the documentation to understand that the issue I report is not a normal behavior

Description

uBlock web inspector dectect double body on website, when block social buttons on wpn.pl.

A specific URL where the issue occurs

http://www.wnp.pl

Steps to Reproduce

1. open website

2. try block social buttons on website (in header website):

   

3. click in propuse cosmetic ##.social filter (without Ctrl) if uBlock no create invalid filter.

4. filter does not work.

   

Expected behavior:

filter should by detect element and no see double body:

##body >  .new:nth-of-type(1) > .pageWidth > .social

Actual behavior:

filter have dectect double body:

##body > body > .new:nth-of-type(1) > .pageWidth > .social`

Your environment

• uBlock Origin version: 1.16.0
• Browser Name and version: Firefox 59.0.2
• Operating System and version: Windows 7 Pro x64

PS. I know, I can create ##.social rule with press Ctrl.

[gorhill]

I can reproduce.

[krystian3w]

I tried in Arch and reproduced: