In my rough draft, chapter 2 and 3 were one chapter. But I added enough content that I thought I should just split the chapters. The setting changed enough to warrant it, so I'm able to give two chapters at once.
Currently, I'm split between working on the rough draft for Chapter 13 and updating/inserting new content for Chapter 4. Probably I will make more progress with Chapter 13 and 14 before working on Chapter 4. Thankfully, it's the holidays so I have lots of time to write it when I'm the mood to do so.