It forces you to wait 24 hours before you get each like back. So if you spend 5 likes at 8 AM and spend the rest around 10 AM, you’ll have 5 likes tomorrow after 8 AM.
Likely what happened is that it allowed you an extra like because 24 hours passed since one was made.
Another thing that can happen is that when you like something and get that message, it appears as though your like posted anyway, but if you refresh the page, it does not stay.