Doesn't sound that off. I can OHP 75kg with a wide grip, my work sets for 10s would probably be 45kg. I can press 80-85kg with a narrower grip. Was your grip the same? It sounds slightly off but not by that much.
If you're doing chest the day before it may influence it (bench press). I wouldnt worry too much, the main thing is that it's hard, a lot of work and you get better over time. Also, stretching is important for overhead press, do a 'cat stretch' often - google it.