Yep, normal. That happens because you hacked it and already knew where it led. If you don't know where an exit leads, it will always show as stairs (otherwise it would be trivial to distinguish between Complex 0b10 exits and branch exits, even without properly identifying them). You'll see the same thing happen if you equip any Signal Interpreter and walk up to an unidentified exit.
The reasoning behind using a different representation for the two types of exits (once you do know) is that only stairs will take you to the next depth and allow you to evolve, while door (branch) exits remain at the same depth, i.e. no evolution.