Yes. People change throughout life. We grow, evolve. Sometimes, those changes are for the better; other times for the worse. I have found that people have roles to play and we have different expectations with each role: boyfriend/girlfriend, husband/wife, father/mother.
Our parenting styles come from different places in our psyche (how we were raised, our insecurities/fears/hopes/dreams, etc.) Some of this stuff is so buried in our subconscious that when they arise to affect our parenting skills, it can be surprising.
Your question probably refers to something such as...your once-carefree and light-hearted husband can turn into an overly controlling father. I hear of a lot of men who, because they were super riotous in their own youth, hold a tight rein on their own teens. They don't want their kids to get into the trouble they did.
The whole "I married a different person" thought sadly affects a lot of marriages. People play roles. I always encourage them to play them all. You can be a great mommy, a great wife *and* still the great fun and loving girl he fell in love with. We are not one dimensional beings.
It's harder for women to switch hats, especially because mommy role is so consuming. My husband has a hard time getting me to let go of that role for an evening out but with practice, I can recall that I am my own person, too. As well as his lover and best friend.