FS Change keeps adding and deleting files from monitoring

I am monitoring /etc/hosts.allow and /etc/hosts.deny for change, with a poll period of 300 seconds.

[fschange:/etc/hosts.allow] index = fschange_main pollPeriod = 300

[fschange:/etc/hosts.deny] index = fschange_main pollPeriod = 300

For some reason, every poll period (5 mins) I get 2 events for each file.... one with "action=add" and another with "action=delete"..... as I said, this keeps happening once per poll period.

Can someone tell me what is wrong? I do not have duplicate fschange stanzas for those files.

Thanks!

John