" always gets converted into \"

Hey there,

I don't really know if that's the right place for this issue. But I didn't find a better one.
Now to my problem: When I create a normal page and set the input format to "Full HTML" I can't use quotation marks ("...") for classes or id's or something.
If I write the output always is . Because of the masked quotation marks my browser of course doesn't understand it.

I already disable all the checkboxes like HTML corrector and stuff but the bug is still there.

I use the newest Drupal version and all the modules are up to date, too.

Thanks,

Nico