I used mapgenie and counted 126 there, but in my log I’m counting 127.
Log from chest during Demon in the Dark side mission is in different category on mapgenie.
During side mission “Demon in the Dark” in Konrad’s Hold you can find Echo Log about Alkonost. It’s in Echo log list, but in mapgenie it’s marked as Miscellaneous not Echo log. Thats why you have 127 logs in menu, but only 126 on mapgenie.