Missing voicemails

Hello, I think I found a bug, dont know if its freepbx or asterisk problem, but if i set “Max Messages” in the “Settings” → “Voicemail Admin” → “Settings”, if the caller leave a new message when we’ve already reached max messages, the caller record overwrite the last message (read or unread, in my case i set the value at 200)
dont know why the file call msg0200.wav when i have only 2 messages on that folder, how its file name updated?

-rw-rw-rw- 1 asterisk asterisk 334 29 ott 15.03 msg0198.txt
-rw-r–r-- 1 asterisk asterisk 423K 29 ott 15.03 msg0198.wav
-rw-rw-rw- 1 asterisk asterisk 334 30 ott 10.54 msg0200.txt
-rw-r–r-- 1 asterisk asterisk 239K 30 ott 10.54 msg0200.wav