time navigation steps

i am running kodi 17.1 krypton on raspberry pi 3
i think , my question is generic .
here is my time navigation file
OpenELEC:~/.kodi/userdata # cat advancedsettings.xml
<advancedsettings>
<video>
<usetimeseeking>true</usetimeseeking>
<smallstepbackseconds>10</smallstepbackseconds>
<timeseekforward>60</timeseekforward>
<timeseekbackward>-60</timeseekbackward>
<timeseekforwardbig>600</timeseekforwardbig>
<timeseekbackwardbig>-600</timeseekbackwardbig>
</video>
</advancedsettings>
from
keyboard_controls (wiki) i conclude that right , left arrow should move me by a minute .
up , down arrow by 10 minutes.
and ‘ by 10 seconds .

i observe that up , down arrow works as expected .
right left arrow shifts me by 10 seconds , not by a minute . why is that ?