Emacs  : GNU Emacs 25.2.1 (x86_64-w64-mingw32)
 of 2017-04-25
Package: Org mode version 9.1.2 (9.1.2-25-g2567fe-elpa @ emacs/.emacs.d/elpa/org-20171030/)

In a .org file (not an agenda buffer) using the clock-report (M-x org-clock-report) with otherwise default options, the order of options manually entered seems to change the output of the report.  Is this a config thing on my end, or is this intended and I overlooked the relevant section in the manual?

Below are the outputs of org-clock-report with only two options reversed (not sure if tables will come out aligned, but differences are obvious).  With ":fileskip0" option last, the output is as expected, with the ":scope agenda" using all agenda files as sources for the clocks, and fileskip paring away tables from files not used.

However, with the "fileskip0" option first, the "scope" option is not honored and only the clock from the current buffer (the default choice for clocktable) is shown.  To do this, I manually reversed the options and then updated the dynamic block via (M-x org-dblock-update) with cursor on the "BEGIN" line.  I get similar behavior with other options, e.g. ":link"  Is anyone able to reproduce this?

#+BEGIN: clocktable :scope agenda :fileskip0
#+CAPTION: Clock summary at [2017-11-01 Wed 16:09]
| File              | Headline                              | Time       |      |
|-------------------+---------------------------------------+------------+------|
|                   | ALL *Total time*                      | *1d 16:50* |      |
|-------------------+---------------------------------------+------------+------|
| WorkTasks.org     | *File time*                           | *1d 0:25*  |      |
|                   | xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx... | 1d 0:25    |      |
|-------------------+---------------------------------------+------------+------|
| Notesxxxxxxxx.org | *File time*                           | *7:14*     |      |
|                   | xxxxxxxx                              | 7:14       |      |
|-------------------+---------------------------------------+------------+------|
| todo.org          | *File time*                           | *9:11*     |      |
|                   | xxxxxxxxxxxxxxxxxxxxxxs               | 0:19       |      |
|                   | xxxxxxxxxxxxxx                        | 8:52       |      |
|                   | \_  sign xxxxx                        |            | 8:52 |
#+END:


#+BEGIN: clocktable :fileskip0 :scope agenda
#+CAPTION: Clock summary at [2017-11-01 Wed 16:52]
| Headline     | Time   |
|--------------+--------|
| *Total time* | *7:14* |
|--------------+--------|
| xxxxxxxx     | 7:14   |
#+END: