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First off it is posible there is a problem with the parser, so if you suddenly see a rise in failed lines after a patch you should contact us. When that said there are bugs in the Age of conan log files here is a few examples

Critical heals: This lines does not log any amount  of healing done.

[20:47:01] Onystar critically heals Ceku for Onystar.

Stranger is your long files: Stranger seems to come into log files for no known reason, we can only guess its releated to client not knowing some entities name or a bug

[21:49:05] Stranger's Kyllikki's Blizzard hits Morbid for 378 frost damage.