Set: always stays at 0?

Hello; I'm a newbie at Twine and coding in general, and I've been following tutorials diligently. However, I keep encountering a problem with set:.
Whatever variable I enter, it keeps changing it to 0.
Like so:


Am I doing something wrong? Please enlighten me, this is frustrating to no end, and it also occurs whenever I give it a number instead of text.
Also, sorry if this has been already asked, I can't find it elsewhere.