If I understand, 60 units = 0.5ml which would be 2.5mg if they mix 2ml with 10mg of peptide. Half that is about 1.25mg for 30 units. 1 unit on your pen = 10000/240=41,6mcg so you probably didn't inject enough.
I wouldn't buy pre-mixed peptides... or pens. Peptide breakdown, price, etc.