Toddler Sleep Issues - A Phase??

I'm wondering what this new phase my toddler is going through...

We put her to bed (usually without argument) around 8:15-8:30pm every night - but she does not fall asleep until 9:30-10:00 pm most nights (like tonight - she is still awake right now doing whatever possible to not sleep!). She sings to herself, she calls for "Dadda & Momma - I lost my binky!" after she threw it on the floor. Or "Dadda! Momma! Where are you?" I don't get it. She sleeps fine throughout the night once she does fall asleep but it's like she can't get herself to sleep for a good hour after she is put to bed.

There are so many phases to children these days - I never know what's going to pop up next!