shortcuts conflict with ibus-daemon

I set some combination keys shortcuts for some actions. For exmaple, shortcuts Alt+j for the "Next Result" action, shortcuts Alt+h for the "Previous Category", etc. That works fine. I means these combination keys shortcuts work exactly like the default single key shortcuts.
But if I launch ibus input method daemon(ibus-daemon), the Alt+j will go next TWO result, the Alt+h will go previous TWO categories when pressed the shortcuts. When I kill the ibus-daemon, these shortcuts act normally again.

I first found the wrong act was in ubuntu 10.04, synapse 2.8 version. I didn't find out what cause this issue, I thought there may be some conflict shortcuts settings. Until recently I switched my linux distribution to Arch, and I create a new user without any old dot files, the issue still being. So I started to think about that may be some running processes affect this. Any way, I finally located the ibus-daemon precess.

I don't know who make the issue, synapse or ibus. Pls have a check about this.