If the website - exodusms.com tells you you have reached the limit, then you already had 3 registered votes in the past 24 hours and received 3 x 3,000 NX.
If gtop100 tells you you already voted, it means the IP you use already voted, to vote 3 times I use my phone on mobile data (not WiFi) and each before each vote toggle on and off airplane mode to get a new IP
