--csr and webroot-path webroot-map errors

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interesting i noticed after a few re-runs on the letsencrypt client, the generated *_chain.pem returns back to same number ?

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at
   /root/0001_chain.pem. Your cert will expire on 2016-04-16. To
   obtain a new version of the certificate in the future, simply run
   Let's Encrypt again.
 - If you like Let's Encrypt, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

prior to the last run, the 0005_chain.pem was latest but after this run it goes back to 0001_chain.pem

ls -lAhrt /usr/local/nginx/conf/ssl/${vhostname} | grep pem
-rw-r--r-- 1 root root  359 Jan 17 08:36 le20.http2ssl.xyz-privkey-p384.pem
-rw-r--r-- 1 root root 2.6K Jan 17 09:07 0001_chain.pem
-rw-r--r-- 1 root root 1.1K Jan 17 09:07 0000_chain.pem
-rw-r--r-- 1 root root 1.5K Jan 17 09:07 0000_cert.pem
-rw-r--r-- 1 root root 2.6K Jan 17 09:07 0003_chain.pem
-rw-r--r-- 1 root root 1.1K Jan 17 09:07 0002_chain.pem
-rw-r--r-- 1 root root 1.5K Jan 17 09:07 0001_cert.pem
-rw-r--r-- 1 root root 2.6K Jan 17 09:25 0005_chain.pem
-rw-r--r-- 1 root root 1.1K Jan 17 09:25 0004_chain.pem
-rw-r--r-- 1 root root 1.5K Jan 17 09:25 0002_cert.pem

so there’s only 3 rotations for full chane 0001, 0003 and 0005 pem files right ? the dates on those files don’t seem to be changing when i go through 3+ runs