The display of paragraphs indented by default is also the normal behavior of Kindle devices that use the older MOBI format, so it isn't only the Cloud Reader that will display your book like this.
You can use
Kindle Previewer 2.94 with the device type set for E-ink/Kindle DX to see how your book will display on older Kindle devices.
---
You should probably ask a moderator to move this thread to the Kindle Formats forum. That is where issues like this are discussed.