There could be lots of reasons for this!
Check the colour sensor is working: Firstly make sure that the colour sensor is working. Hold your finger over it and it should give feedback at the top of the SPIKE programming app that it is seeing red (your blood!).
Port Check: Make sure that you have it plugged in the correct Port. It should be matched to the Port that you have used in your code.
Printed Colours: It can be a bit fussy about printed colours so make sure that the print outs are clear. All of the colours used are matched to the correct LEGO values for those colours - so maybe try a different printer and see if that makes a difference!
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