Spigit version: https://hub.spigotmc.org/versions/831.json

My server in the case where no player, still loads more than 2,100 more chunks.
I try to debug it, found that most of the chunk is loaded by BlockFire.

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Please look at latest.log
[17:15:30] /list Confirm that the server does not have a player in (actually has already turned on the whitelist from 5:00 start)
[17:15:32] /gc Displays the number of chunk
[17:15:41] /gc Displays the number of chunk
[17:15:52] /pd dc I write the plugin output loaded chunk list
[17:16:02] /gc Displays the number of chunk

files:
latest.log
log file
DumpChunks_2016-5-21_17-15-52.log
"/pd dc"output
chunkdebug_2016-5-21_17-15-25.log
Chunk loaded and unloaded the debug log
Is too large to upload, please look here:
https://raw.githubusercontent.com/Cat7373/tmps/master/chunkdebug_2016-5-21_17-15-25.log