lost dump ?!?!?

Hi list, I know I am very slow in understanding osmocom-bb, anyway this is just a quick question. Is it possible that some of the gsmtap messages are getting lost? For example I can see a LOCATION UPDATE and a LOCATION ACCEPT from the 'mobile' application log but there aren't the corresponding messages in the wireshark capture, though this does not always happen, I mean I had captures of location updates other times, this is why I am wondering if they are getting lost and what it does depend on. for what I understood the gsmtap functions utilities are in gsmtap_util.c and the one to send the messages on the socket is called by l1ctl.c am I right? Can you help me understanding why I cannot see all the messages? thank you in advance Loretta