I have set up my lottery to work with votes for the server and every day I check it the total players in the lottery is lower than it was previously. for example yesterday we had 8 people entered and today we have 4.

The ability to buy tickets is turned off so the only way people can get tickets is by voting for the server with simplevotelistener.

Any idea why this would happen?

After relooking at the code, for someone reason I didn't have the Lotteries save after rewarding a player for voting. Although that still doesn't explain the disappearance, because if even the server restarted, the lotteries save just in case. I've had other reports of people' tickets missing or mysteriously getting deleted as well. Going to look further into this before pushing out an update.