Newly created nodes affect also Alpha

Hi,
it seems I accidentally did something and now all my newly created nodes do not affect RGB but also A channel, even those that should not, like highlight node for example. It started right now so i had to do something by accident, but i have no idea what.
Any help will be much appreciated. Thank you in advance.
it seems I accidentally did something and now all my newly created nodes do not affect RGB but also A channel, even those that should not, like highlight node for example. It started right now so i had to do something by accident, but i have no idea what.
Any help will be much appreciated. Thank you in advance.