There seems to be a limitation on the characters you can use in the resulting string for the rangemap command. It would be interesting to know if this is an intentional limitation.
You can use this to work around your problem:
|rangemap field=MSEC 0=0-500 1=501-1000 2=1001-1500 3=1501-2000 4=2001-2500 default=5 | eval range = case(range==0,"0-0.5 Sec",range==1,"0.5-1 Sec",range==2,"1-1.5 Sec",range==3,"1.5-2 Sec",range==4,"2-2.5 Sec",range==5,">2.5 Sec")
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