I actually wasn't aware that there was a binary client for itch, so I just downloaded it to run on Linux Mint and yeah; it's broken. I searched my own game while logged in and it couldn't find it... but I could just click on it via my username.
My assumption is that this had either been abandoned, or it hasn't been considered "high priority" for a while... either way; the download should be pulled off the main page for now. It's actually not good for how itch is perceived. I'd recommend posting this in one of the "ITCH.IO" forums, underneath "GENERAL". I'd assume under the sub-forum "ideas and feedback", though I would of thought it was "itch app development", but I'm not seeing any complaints there....
I'm not connected with the itch.io dev team at all, I'm just a solo game dev, but what operating system are you running? I might be able to help with articulating an inquiry.