Example:

#include <stdio.h>
int main(int argc, char* argv[]) {
    printf("C users in shambles");
}

Exact same code but using the full width hashtag pound symbol:

＃include <stdio.h>
int main(int argc, char* argv[]) {
    printf("C users in shambles");
}

Updating the library seems to have done the trick. They seem to have discontinued the colour scheme I was using previously so I took the opportunity to try and make something myself that fits in with the rest of the design more. Hopefully it's appealing.

I completely forgot to attach the screenshot I took of your post before updating the site.

for comparison: