Gtop100 keeps saying that I've voted already. Done the captcha and everything. Been going on for a few days. I've been voting on my phone because of this - https://royals.ms/forum/threads/cant-acess-website-on-my-laptop.90690/
Seems like someone with the same IP as you voted on GTop100 as well. Not surprising if your ISP keeps changing your public IP. Especially in Singapore. I used to have this problem in the past, but not anymore after I recontracted a few years back. Actually with mobile in Singapore, it's also expected that the public IP will be changed constantly as you move from location to location.
Maybe you voted for another server on gtop100? You can only vote for 1 server every 24 hours on gtop100.
I am currently facing the same problem as you as well. I guess there's nothing much we can do at the moment.