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.

You most likely saved new defaults for that node.
Add another one, RMB on the Title of the Node and select settings->reset default

Yup, that was it. Accident right click. Thank you very much!