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why a parameter changes when transfered to subroutine


I got a subroutine resh_dis(hubble,redshift,distance) which calculate this:

distance = 1.0D0/hubble*redshift*3000000D0*(1+redshift/2)/((1+redshift)**2)

in the subroutine all variables (including hubble ) were defined to be
real(kind=8), I admit that in the main program the hubble is real(kind=4)
like 62.0, than when I transfer it to the subroutine, the distance simply
become infinity, if I tranfered 62.0D0 instead of 62.0, everything becomes
fine, why? I use the gfortran compiler. 
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