You say "Please vote for your favorite entries which are shown in the comments below". That is confusing, not all entries are shown in the comments.
You should either say that and post all entries yourself. Or say something like "Please check the entries using this tag, and post your favorite entries so other people can vote them", and post 0 entries yourself.
The way you have done it, it is unfair and it sucks.
Also, allowing people to vote for the winner is great, but reserving the right to change the winner if you don't like it, well, that sucks too.
I would prefer if you chose a winner and thats it, at least it is more transparent.
TLDR sorry but everything sucks.
I have added some edits based on your response.....
I wanted to clarify that these 31 entries were added by the Slothicorn community in our Discord channel. The group selected these entries, as the top ones. There were way more than this submitted, but we had to narrow it down. If you feel that there is an entry that we missed, which you think is really good, feel free to add in the comments.