Source code 3 Rows whitespace

I am not sure where this is coming from, but it seems that in my source code there are 3 white space rows above the generated code output of everything from templates to xml.

I have checked for

  • plugins
  • browser addons
  • tried different browsers because of addons
  • checked templates
  • even if i dump&die something above the kirby render code…
  • checked for whitespace at the end of includes

anyone has an idea?
whitespace

since those white space are generated, things like xml sitemap fail…

found it, there was indeed some whitespace…