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In case somebody else is in the same situation: The exact problem was that I accidentally used the same names for other related variables so my launchfile was colliding with my configuration. For example I had put:
<param name="cur_tilt_angle" value="/cur_tilt_angle,std_msgs/Float64,publishedTopic" />
and in the configuration:
gen.add("cur_tilt_angle", double_t, 2, "Current real tilt of the camera", 0.0, -65.0, 65.0)
The problem was as silly as expected; I just forgot that both sets of variables go to the same parameter server so I didn't even check the names until now.
Thank you for your answers!!