Why do characters get interpreted as algebraics?

[HP67]

Thanks. I checked and a bunch of characters that isn't a command goes on the stack single-quoted as a global name (type 6).

I still don't exactly get what's going on here but Dizzy's suggestion works great in my situation. If the string is already a quoted string then concatenating the empty string to it does nothing. If it's a global name then it gets turned into a string.

OTOH ->STR seems to produce strange results. A global name gets turned into a string but with single quotes inside the double quotes. It would be great if somebody can explain this.

Perhaps Tim already did, but if so then I didn't understand what he wrote.