hg shelve created a commit, I don't understand - mercurial

Question

I'm a bit confused by hg shelve because the documentation is rather sparse. Somehow I got a commit in my log of the form:
changeset: 29:ad47ed1ca915
parent: 27:afca280f2884
user: shelve#localhost
date: Wed Jun 08 15:30:36 2016 -0600
summary: changes to: ...
I'm confused as to where this came from. It was my understanding that shelve was just stuffing things on the local machine and that they wouldn't get in the history. Am I misunderstanding that?
Here's my hg command history:
hg status
hg shelve list
hg shelve --list
hg unshelve
hg unshelve
hg resolve
hg resolve -all
hg resolve --all
hg resolve --all
hg clone a/ b
# By this point we have the commit (since 28 is after 27)
hg update -r 28
EDIT:
Ok, so the problem seems to be a partial unshelve. However, because I pull the changesets else where now I'm stuck with the changesets and am not sure what to do :(
EDIT2: Here's an example of how to cause this problem:
~ $ cd tmp
~/tmp $ mkdir shelve shelve/a
~/tmp $ cd shelve/a
~/tmp/shelve/a $ hg init
~/tmp/shelve/a $ echo a > a
~/tmp/shelve/a $ hg add a
~/tmp/shelve/a $ hg commit -m "a as a"
~/tmp/shelve/a $ cd ..
~/tmp/shelve $ hg clone a b
updating to branch default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
~/tmp/shelve $ cd b
~/tmp/shelve/b $ echo aa > a
~/tmp/shelve/b $ hg commit -m "a as aa"
~/tmp/shelve/b $ cd ../a
~/tmp/shelve/a $ echo aaa > a
~/tmp/shelve/a $ hg shelve
shelved as default
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
~/tmp/shelve/a $ hg pull -u ../b
pulling from ../b
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
~/tmp/shelve/a $ hg unshelve
unshelving change 'default'
rebasing shelved changes
rebasing 2:6696488053d1 "changes to: a as a" (tip)
merging a
3 files to edit
was merge successful (yn)? n
merging a failed!
unresolved conflicts (see 'hg resolve', then 'hg unshelve --continue')
~/tmp/shelve/a $ hg heads
changeset: 2:6696488053d1
tag: tip
parent: 0:845abf4a2513
user: shelve#localhost
date: Thu Jun 16 19:44:05 2016 -0600
summary: changes to: a as a
changeset: 1:e1f75f582f85
user: Alex Orange <crazycasta#gmail.com>
date: Thu Jun 16 19:44:05 2016 -0600
summary: a as aa

Answer 1

Here's my solution. Also shows a bit more of the problem. The problem comes if you do an hg pull with an unresolved unshelve.
~ $ cd tmp
~/tmp $ cd shelve/a
~/tmp/shelve/a $ hg resolve a
merging a
3 files to edit
continue: hg unshelve --continue
~/tmp/shelve/a $ cd ../b
~/tmp/shelve/b $ echo Cause failure
Cause failure
~/tmp/shelve/b $ hg pull ../a
pulling from ../a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files (+1 heads)
(run 'hg heads' to see heads, 'hg merge' to merge)
~/tmp/shelve/b $ hg heads
changeset: 2:6696488053d1
tag: tip
parent: 0:845abf4a2513
user: shelve#localhost
date: Thu Jun 16 19:44:05 2016 -0600
summary: changes to: a as a
changeset: 1:e1f75f582f85
user: Alex Orange <crazycasta#gmail.com>
date: Thu Jun 16 19:44:05 2016 -0600
summary: a as aa
~/tmp/shelve/b $ cd ../a
~/tmp/shelve/a $ hg unshelve --continue
rebasing 2:6696488053d1 "changes to: a as a" (tip)
unshelve of 'default' complete
~/tmp/shelve/a $ hg commit -m "a as aaa"
~/tmp/shelve/a $ cd ../b
~/tmp/shelve/b $ hg pull
pulling from /home/crazycasta/tmp/shelve/a
searching for changes
adding changesets
adding manifests
adding file changes
added 1 changesets with 1 changes to 1 files
(run 'hg update' to get a working copy)
~/tmp/shelve/b $ echo Problem
Problem
~/tmp/shelve/b $ hg heads
changeset: 3:a804c9f51cd6
tag: tip
parent: 1:e1f75f582f85
user: Alex Orange <crazycasta#gmail.com>
date: Thu Jun 16 20:02:43 2016 -0600
summary: a as aaa
changeset: 2:6696488053d1
parent: 0:845abf4a2513
user: shelve#localhost
date: Thu Jun 16 19:44:05 2016 -0600
summary: changes to: a as a
~/tmp/shelve/b $ echo Solution
Solution
~/tmp/shelve/b $ hg strip -r 2
saved backup bundle to /home/crazycasta/tmp/shelve/b/.hg/strip-backup/6696488053d1-313495de-backup.hg
~/tmp/shelve/b $ hg heads
changeset: 2:a804c9f51cd6
tag: tip
user: Alex Orange <crazycasta#gmail.com>
date: Thu Jun 16 20:02:43 2016 -0600
summary: a as aaa