Why doesn't this script work? It plays both animations instead of just one each time.

So when a player clicks once, it plays [1] If a player clicks twice, before 0.3 seconds are over, it plays [2] If a player clicks three times, before 0.5 seconds, it plays [3] If they don't click before the certain time limit, it plays 1. The issue I keep getting is if a player clicks twice, it plays both 2 AND 3. How do I fix this?

function button1Down()
    if (activated and not animating) then
        if (secondSlash and tick()-secondSlashTime < 0.3) then
            slash[2]()
            secondSlash = false

        if (activated and not animating) then
            if (thirdSlash and tick()-thirdSlashTime <0.5) then
                slash[3]()
                thirdSlash = false
            end
        end
        else

            slash[1]()
            secondSlash, secondSlashTime = true, tick()
            thirdSlash, thirdSlashTime  = true, tick()
        end
    end
end