i have had this problem in the past and i manged to do a 5 button version for 16x2 lcd and a nokia 5110 screen. send some pics then i will assist you with the coding.
please note if this is correct.
1 button gets pressed to increas score by one increment on a display.
another button is pressed to decrease scare by one increment.
when a certain number score is reached the display roles over to 0 or if a button is pressed for a set amount of time it resets the display to zero.
I still can't make out your circuit diagram clearly, but assuming that you have connected the TPIC6B595's correctly, you should start by seeing if you can make the numbers light up at all. Start simple and write out a bit stream that lights up one output at a time. Something like:
Nokia 6.1 Plus Schematic Diagram Download
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