Can't config custom port during install process

Hello,

I downloaded Confluence 5.8.4 Linux installer, ran bash atlassian-confluence-5.8.4-x64.bin

Initial log:
=====================================
Unpacking JRE ...
Starting Installer ...
Jun 07, 2015 1:25:28 PM java.util.prefs.FileSystemPreferences$2 run
INFO: Created system preferences directory in java.home.

This will install Confluence 5.8.4 on your computer.
OK [o, Enter], Cancel [c]
o

Choose the appropriate installation or upgrade option.
Please choose one of the following:
Express Install (uses default settings) [1],
Custom Install (recommended for advanced users) [2, Enter],
Upgrade an existing Confluence installation [3]
================================================

Then I typed 2, Enter

It says:

=================================
The following default options cannot be used. You will be asked to provide alternatives for these options.

• HTTP Port (In use)

Configure which ports Confluence will use.
Confluence requires two TCP ports that are not being used by any other
applications on this machine. The HTTP port is where you will access
Confluence through your browser. The Control port is used to Startup and
Shutdown Confluence.
Use default ports (HTTP: 8090, Control: 8000) - Recommended [1], Set custom value for HTTP and Control ports [2, Enter]
======================================

If I type 1, then this happens again, which is normal. If I type 2, then this happens again, too! It tells me that default ports are in use. No prompt to let me type in my custom ports!

P.S. if I type 3, only the last line appears:
Use default ports (HTTP: 8090, Control: 8000) - Recommended [1], Set custom value for HTTP and Control ports [2, Enter]
Which mean it knows it only accepts 1 and 2.