Well I asked Lucy!
and she said what the hell you talking about?
font schmont
ditch that simplex2 font or at least select a different on for it to use.
I did a search on simplex2 & came up pretty empty.
Autocad had a simplex2 released in the R14 days
I downloaded that file and it was different to the one in your zip file. It behaved normally.
The one youv'e got only has 7 letters that show as alpha symbols b,c,m,n,v,x & z all the rest have either fractional symbols or a centre line type symbol ie CL overlapping.
So I would say its a custom written font for specific purposes.