Need to press buttons twice

Manufacturer: Amino
Model: 7x

Hi,

So the dutch ISP provider Odido deliveres an Amino 7x TV box. I learned the codes from the original remote to the UC dock. That works but when i want to change channel or use the arrow keys i need to press them twice on the uc remote 3.

Now i use an Logitech Harmony and that works perfect. I also tried to learn the codes directly from the Harmony to the UC dock. That works. And get different IR codes but i still need to press the buttons twice.

Is there someone who can help me with this? Thanks!