When using the K155ID1 IC, some numbers of Nixie tubes do not emit properly
Try anode resistor 33 - 18 -15 -  10K
k155ID1 internal zener diode 60v, pull-up resistor connected +5v  is 15 - 33K.
Kathode (digit ) 'poisoning' - when highter currentt it shine well.
Change back to 27 -33K when OK.