Yes, this problem is reported pretty often:
http://www.eq2interface.com/forums/s...ead.php?t=7580
http://www.eq2interface.com/forums/s...ead.php?t=8079
http://www.eq2interface.com/forums/s...ead.php?t=8198
http://www.eq2interface.com/forums/s...ead.php?t=8603
Also, please double check the existing map before adding your POIs. There are now 3 Ancient Dashers, 3 sift dashers, 4 Cicero Puers, 3 exits to the Thieves' Way, etc. It looks like a good portion of the POIs in the Serpent Sewers are completely redundant, which makes these maps really hard to use.