[Az-Geocaching] Logs questions

Anyone know the reason for the log books in the caches? I have a cache
where the log book in the cache does not match the log book on the web. It
appears that several people have logged the cache on-line, but not in the
cache. Do I delete the on-line entries because they don't match the cache
log?
One of the entries is from a cacher with over 200 finds. Does anyone else
besides me ever compare logs?

GeoRaptor