Logitech's Harmony sends different signals with same button

[Ges]

Hi ppl!
I need your help

I have this hardware:
- Logitech Harmony 555 programed as Microsoft Remote Control model:
1039
- Igor Cesko's IR-USB dongle builded by this scheme on his page
www.cesko.host.sk/IgorPlugUSB/IgorPlug-USB%20(AVR)_eng.htm

Problems goes like this:
I'm using Girder 5 beta. In plugins i have loaded an IgorUSB plugin,
downloaded from his website. I've left setup of that plugin on
"default"
Then I go in Girder to "add remote" option, and on press on any of my
Harmony's buttons, setup goes to mapping the keys (so far so good)
BUT, then a problem: while on mapping, any pressed key on remote sends
a whole bunch of signal so 3 or more buttons are mapped by one click!

It looks something like this:
If i press button "Play" it sends a burst of commands, like "signal_1,
signal_3, signal_x, signal_y", always more that one command per click
Then, like if I press a button "ok" it sends "signal_4, signal_x,
signal_5, signal_6"

As you can see, a remote sends a same command on two different buttons
(a signal_x).

My questions are
1. how to restrict remote to send only one sort of signal/command per
key press?
2. how to restrict remote to send only one signal/command per key
press?

a desired result would be:
If i press button "Play" it sends a command like "signal_x, stop"
Then, like if I press a button "ok" it sends "signal_4, stop"
Different single command per keypress...

Thanks in advance!