Why won’t my hair lay flat anymore after more than a week, and why is it no longer greasy all day like it used to be?

After more than a week, my hair keeps staying up and won’t lay flat anymore. It also doesn’t get greasy like it used to, not even a little. Last night it did get a bit oily, but by the morning, it was back to being dry and standing up again. When I combed it, it stayed up and wasn’t greasy at all. It’s new for me to have hair that’s not oily all day and doesn’t fall down anymore.
Why won’t my hair lay flat anymore after more than a week, and why is it no longer greasy all day like it used to be?
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