When you write you typically have an idea of how you sound and what you’re saying. I mean, that’s obvious, right?
The consistency in your writing is typically found in yourself. You’re the person writing so everything you write should sound the same, right? Well, not always. Oftentimes you’ll begin to write and realize that your style shifts part of the way through. I notice this with my own writing. I go from very plain and utilitarian descriptions to almost poetry in the same chapter. There’s nothing wrong with either, but you need to make sure you’re consistent.