I found the problem.
in the MY_fuel config file. the max page params was set to 0.
$config['max_page_params'] = 0;
changed it to
$config['max_page_params'] = 1;
and now it works
I got the idea that i might be due to the fuel_mode.
Tried to change it to auto, nothing seems to change. So now I am confused if it should be
$config['fuel_mode'] = AUTO;
$config['fuel_mode'] = "AUTO";
$config['fuel_mode'] = "auto";
or
$config['…