Tone of voice, somewhat confusing?

My partner been going through much, is in his own head sometimes. When he phones, calls me I can hear the love in his voice, but at home he has confused me somwhat as he sounds angry or heavy but then as I come to him he just wants to cuddle or say something. When I ask him is it something I've done he says no. Is it normal to sound one way but be another? I don't know if I should say anything else about it, I've been hoping it should pass on its own, but so far it stays the same. Is this normal considering if someone is having a difficult time about other things in life thats on his mind?

Tone of voice, somewhat confusing?
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