So I'm not sure why, but the URL is set to https://twitter.com/search?q=%40AggroTactics rather than https://twitter.com/search?q=AggroTactics. The first URL does a search with @AggroTactics rather than #AggroTactics. So I changed it on my local but it instead added the literal '@'... not sure where that is coming from. Not sure if that was intended... seems weird.
That might be a nice workaround, although slightly nefarious in spirit
That said, I don't use Pushbullet anymore, as I no longer support them since they went pro. Happy to hand over the reigns to somebody else if a volunteer is available