It is extremely common to set out expecting to discover one thing and instead to discover another (e.g. Fleming, Jansky, Kamerlingh Onnes, and innumerable others). This is so common that it even has a name: serendipity. Serendipity is not blind luck. It is the opposite of blind luck; it is the kind of luck that you earn by being smart and keeping your eyes open. 
After an scientific discovery has been made the difficulty is to have it properly interpreted and adopted.
- Irving Wallace (1965). The Sunday Gentleman. “...the difficulty is less in discovering than in having discoveries understood and adopted.”