Fwiw every time I clean a keg and sanitize it I'll leave the starsan in the keg until I need it (under pressure) and I'll run a minute or so of sanitizer through my tap in between connections. I have 3 kegs and can only keep 2 full of beer so I usually have the third full of starsan.
Your reading indicates it did in fact ferment but I got to say that seeing no activity from your airlock with a hefe is odd. I usually have to tube mine into a bucket of starsan for the first couple of days because I get so much blow off. But like others have said the only thing that really...