You have the incorrect API Claim Reward (GET URL)

Look at the server listings API Keys and make sure you put the correct "Claim Reward" In the right place.

Also, Please post config (with keys blurred)

{
  "Commands": {
    "money": "deposit {playerid} {value}",
    "oxidegrantgroup": "oxide.usergroup add {playerid} {value}",
    "oxidegrantperm": "oxide.grant user {playerid} {value}",
    "oxiderevokegroup": "oxide.usergroup remove {playerid} {value}",
    "oxiderevokeperm": "oxide.revoke user {playerid} {value}",
    "rp": "sr add {playerid} {value}",
    "tempaddgroup": "addgroup {playerid} {value} {value2}",
    "tempgrantperm": "grantperm {playerid} {value} {value2}",
    "zlvl-*": "zl.lvl {playerid} * +{value}",
    "zlvl-c": "zl.lvl {playerid} C +{value}",
    "zlvl-m": "zl.lvl {playerid} M +{value}",
    "zlvl-s": "zl.lvl {playerid} S +{value}",
    "zlvl-wc": "zl.lvl {playerid} WC +{value}"
  },
  "Discord": {
    "Discord webhook (URL)": "SENSURED",
    "DiscordMessage Enabled (true / false)": "true",
    "Enable @here alert (true / false)": "true",
    "Title": "Vote"
  },
  "Rewards": {
    "@": [
      "money: 250"
    ],
    "first": [
      "zlvl-*: 5"

    ],
    "vote3": [
      "tempgrantperm: backpack.size2-2d"
    ],
    "vote4": [
      "tempgrantperm: backpack.size3-2d"
    ],
    "vote5": [
      "tempgrantperm: backpack.size4-2d",
      "money: 750"
    ],
    "vote6": [
      "tempgrantperm: backpack.size5-2d"
    ],
    "vote7": [
      "tempgrantperm: backpack.size6-2d"
    ],
    "vote10": [
      "tempaddgroup: vip-1d",
      "money: 750"
    ]
  },
  "Servers": {
    "ServerName1": {
      "BestServers.com": "925:SENSUREDKEY",
      "RustServers": "159301:SENSUREDKEY"
    },
    "ServerName2": {
      "Beancan": "ID:KEY"
    }
  },
  "Settings": {
    "Enable logging => oxide/logs/EasyVote (true / false)": "true",
    "Globally announcment in chat when player voted (true / false)": "true",
    "Prefix": "<color=orange>[EasyVote]</color>",
    "Send thank you message to player who voted (true / false)": "true",
    "Vote rewards cumulative (true / false)": "false"
  },
  "VoteSitesAPI": {
    "BestServers.com": {
      "API Claim Reward (GET URL)": "https://bestservers.com/api/vote.php?action=status&key={0}&steamid={1}",
      "API Vote status (GET URL)": "https://bestservers.com/api/vote.php?action=claim&key={0}&steamid={1}",
      "Vote link (URL)": "https://bestservers.com/server/{0}/vote"
    },
    "RustServers": {
      "API Claim Reward (GET URL)": "http://rust-servers.net/api/?action=custom&object=plugin&element=reward&key={0}&steamid={1}",
      "API Vote status (GET URL)": "http://rust-servers.net/api/?object=votes&element=claim&key={0}&steamid={1}",
      "Vote link (URL)": "http://rust-servers.net/server/{0}"
    }
  }
}

change

"ServerName1" to the name of your server.. it just looks better in chat

and then remove 

,
    "ServerName2": {
      "Beancan": "ID:KEY"
    }

then in settings section change 

"Prefix": "<color=orange>

to 

"Prefix": "<color=#ffa500>

MikeHawke

change

"ServerName1" to the name of your server.. it just looks better in chat

and then remove 

,
    "ServerName2": {
      "Beancan": "ID:KEY"
    }

then in settings section change 

"Prefix": "<color=orange>

to 

"Prefix": "<color=#ffa500>

Sorry... The issue would be caused by the API not updating the claim. Try updateing and clearing an unused entries from the config..

If you are using BestServers then there was an issue that the owner had fixed where cloudflare was stopping the claim key from working.. this should now be sorted