Highrez

XMBC Version: 2.19.2
Windows Version: Windows 10
Mouse Information (brand/model): Pictek T16
Relevant Computer Information (CPU, RAM etc): Intel(R) Core(TM) i3-4010, 4GB Ram
Did the problem occur after an upgrade of XMBC? (If so, from what version?): No, I have not tried on other versions.
Did the problem occur after a Windows update/upgrade? (If so, from what version?): No
How long have you used XMBC?: About an hour
What language and keyboard layout do you use in Windows?: English

Clear description of the problem - try and include as much information as possible, including what button and mappings you are having problems with (if applicable).: On Layer 1 I am trying to make the Right Button and set it to Double click. When I do that and then click with my right mouse button, it makes a left button click.

The double click option in the dropdown is for a traditional left button double click (no matter what button you assign it to).
To double click the right button, instead, select "Simulated Keystrokes" (this can simulate mouse buttons and much more besides just keystrokes ).
In the Sim Keys config window input field, type {RMB}{RMB}
That should do it but you can tailor it a bit more if needed, and in some cases, you may need to add a delay between the two (to do that, try {RMB}{WAITMS:50}{RMB} for 50ms delay between each click.

Let me know how you get on.

Regards,
Phil