Spoilers & Nested Spoilers Error

Hi, I need some help please!

I’ve read a few forum posts about spoilers & nested spoilers ie a spoiler inside another.

Initially I just used:

[spoiler title=”TEXT” style=’blue’ collapse_link=’true’]
[spoiler title=”TEXT” style=’steelblue’ collapse_link=’true’]
[/spoiler]
[/spoiler]

This partially worked, the 2nd spoiler was within the first & both expanded as they should have but the text from 2nd spoiler was not contained within the spoiler but after!

I’ve tried the variations found within the forums, such as:

https://wordpress.org/support/topic/nested-spoilers
[spoiler]
Parent spoiler
[_spoiler] Nested spoiler [_/spoiler]
[_spoiler] Nested spoiler [_/spoiler]
[/spoiler]

AND

https://wordpress.org/support/topic/spoilers-nested-inside-spoiler
[su_spoiler title=”Spoiler title1″ class=”my-custom-spoiler”]
Spoiler content 1
[/su_spoiler]

[su_spoiler title=”Spoiler title2″ class=”my-custom-spoiler”]

[_su_spoiler title=”Sub-Spoiler title1″ class=”my-custom-spoiler”]
[_/su_spoiler]

[_su_spoiler title=”Sub-Spoiler title2″ class=”my-custom-spoiler”]
[_/su_spoiler]

[_su_spoiler title=”Sub-Spoiler title3″ class=”my-custom-spoiler”]
[_/su_spoiler]

[/su_spoiler]

[su_spoiler title=”Spoiler title3″ class=”my-custom-spoiler”]
Spoiler content 3
[/su_spoiler]

AND

https://wordpress.org/support/topic/nesting-spoilers-not-working-inside-a-panel
[su
[_su
[__su

with complimentary closing tags.

A sample of the issue can be found here:
http://www.buddy18.com/members/naughtybutn1ceguy/buddyblog/my-posts/12047/

Is this this possible with my version: WordPress 4.5.1 running Kleo theme. If so, how please?