Just thought I might mention a clear quality control issue you guys appear to be having, I recently purchased a TT esports Challenger Pro as my new gaming keyboard and immediately had a problem with it not connecting. I found the mini usb port where the cord connects was very loose which meant the keyboard was unable to maintain a signal. A large amount of force was required to gain a connection and when released the cord would immediately disconnect. Though it was possibly just the cord, either way I took it back to my seller to get a replacement.
I then went home with a new Challenger Pro and after 1 hour of fussing around, I have confirmed without a doubt that the spacebar does not work on this second keyboard. It is quite clear to me that these are indicative of poor manufacturing. I suggest you take a look at your quality control procedures.