This is a link to the newest version of the QMK firmware for the uConsole. I just downloaded it and it works. Just flash per the instructions on the first post.
I’m running it on my uConsole and works way better then the stock firmware and I had the same issue with the space bar.
This is the replacement trackball I used and it's worlds better, I'm not sure what one you used.
https://www.aliexpress.us/item/3256802802650565.html
Some people got bad ones of these and ordered a few to get a good one.