Question is are you on level ground? I’ve noticed when you melee your character auto looks level. So if someone is below you you’ll go over their head and miss. This is on all characters. I don’t play Titan so I can’t relate to your issue.
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Happens mainly when I get into 1v1 melee battles in my bubble. Usually when both of us are fighting on the edge of the bubble. The melee is able to make contact with the bubble or barricade. The melee shouldn't be able to collide with the barrier. I have noticed that a basic hunter knife melee has little issue with this bug and will successfully hit through the barricade or bubble more often than the titan punch standard melee.