You have not. The rate limit has been in effect for several versions now, but only in the most recent release (FTL 5.9) do we show a diagnostic message when the rate limit is reached. Previously, clients were rate limited silently.
If all your queries to Pi-hole come from the router IP, this is likely the case. Instead of individual clients being seen (each of which will be evaluated independently for rate limiting), all the traffic is coming via the router on a single IP and rate limiting is applied to this single client seen by Pi-hole (which is actually the combined traffic from all your devices).