Go to engine input>action mappings in project settings, make sure jump is the only one with spacebar attached, i think by default press fakefocusedwidget is also set to use spacebar? its one of the other ones besides jump, it overrides the jump because it consumes the command i think, so just remove spacebar from any of the input events listed there aside from Jump, then in your character blueprint, eventgraph just make spacebarpress and link to inputaction jump… and wallah…