have reported about that problem long time ago
bug fixes/features request dm500

part of that problem comes when on one satelitte position presented more than one transponder with same TransponderID like:
12190L; 12226 L; 12380 L on 36E have same NID-TID(112-2)
http://www.lyngsat.com/36east.html

also i have similar problems with few transponders on 13E, but i didnt check why

how many years requered to fix that Enigma1 BUG ???

i have rescan all positions from blank list just month ago
and there again comes problem with incorrectly added services:
one zap to channell AXN and autoscan adds a lot newfound channels
but on zap to that channels which marked as !Newfound enigma says "Service not found"

about fix:
1. autoscan must just update channells info if they already presented in list (dont add new)
2. autoscan mustn't add new transponder to any position,
_ sometime Diseq wasnt swich and stays on previous frequency on another sat position,
_ but Enigma thinks it is on new sat position and there arent that channels in list and wrongly adds them
3. in caese i dont belive that problem will be fixed soon i'd like ask one more option:
_ "Delete all 'NewFound' channels" around option "Remove all 'NewFound' flags"