67 Dart 270...Project Old School

Hello all,

Over the past weekend I installed new bulbs for the rear brake lights and front turn signals. I also mounted the front headlights. When I was testing the turn signals, parking lights and running lights, I noticed the front turn signals turned off when I went from parking light configuration to full running lights with the headlights on. Is this a feature or is there something wrong with my headlight switch?
Thanks,