indents disappearing from output after previewing post

[Crackity]

Hello,

I noticed this issue yesterday during another post and a moderator suggested I post this here to let someone know.
I was having trouble with getting my output to match my example in my book. I figured it must've been something I was missing, but then I noticed that the indents in my output would disappear after previewing my post.

Here is an example before previewing my post:

Output:
Copy Sort...
Array : [5, 3, 1, 2, 6, 4]
	Removing value 1 from [5, 3, 1, 2, 6, 4]
	Removing value 2 from [5, 3, 2, 6, 4]
	Removing value 3 from [5, 3, 6, 4]
	Removing value 4 from [5, 6, 4]
	Removing value 5 from [5, 6]
	Removing value 6 from [6]
Copy : [1, 2, 3, 4, 5, 6]
Array : [5, 3, 1, 2, 6, 4]
>>> 

and here is what it looks like after previewing:

Output:
Copy Sort...
Array : [5, 3, 1, 2, 6, 4]
Removing value 1 from [5, 3, 1, 2, 6, 4]
Removing value 2 from [5, 3, 2, 6, 4]
Removing value 3 from [5, 3, 6, 4]
Removing value 4 from [5, 6, 4]
Removing value 5 from [5, 6]
Removing value 6 from [6]
Copy : [1, 2, 3, 4, 5, 6]
Array : [5, 3, 1, 2, 6, 4]
>>> 

For some reason when I preview my post it removes the indent from my output, it really threw me off at first because I didn't catch it the first couple of times that it did it.

Because I saw this question asked in other posts while looking to see if this issue had already been reported I am running:

Windows 7 home edition
Google chrome, Version 59.0.3071.115 (Official Build) (64-bit)