tcsh and matching [0-9]

Question

I have a rather odd situation where [0-9] matching is not working under tcsh (but working under csh and bash). here is an example:

muon:~/tmp.52 ls
a0  a1  a2  a3  a4  a5  a6  apollo_help.docx*
muon:~/tmp.53 ls a[4-9]
a0  a1  a2  a3  a4  a5  a6
muon:~/tmp.54 csh
%m:%B%~%b.%h ls a[4-9]
a4  a5  a6
%m:%B%~%b.%h exit
%m:%B%~%b.%h exit
muon:~/tmp.55 bash
muon:~/tmp$ ls a[4-9]
a4  a5  a6
muon:~/tmp$ exit
exit
muon:~/tmp.56 ls a[4-9]
a0  a1  a2  a3  a4  a5  a6

I have played with locale settings but it did not fix the problem. the OS is ubuntu. Interestingly, on another ubuntu system, [0-9] matching worked as expected under all 3 shells (tcsh included). It seemed like some funny things are hiding at the system (not user) level. what could that be? thanks very much.