There are like a 100 of these posts in the past week do a quick search

Try logging in from mobile or via a VPN. If it's happening on all your accounts it's unlikely someone is spamming your login and more likely that this is the server issue many people have been suffering from recently.

Is anyone having issues with this when trying to log in to RuneScape? All three of my accounts are suffering from the same thing so i can't login. I tried to log into the main website as well but it says my password is incorrect... Please help.

Too many login attempts...