Repeating waves

I was playing around with different defensive waves today and I noticed that I got some waves that repeated.  For instance, with about 1 minute or so left my waves started repeating.  Is this normal?  I guess this means that I actually get more than 8 total waves (probably about 11)

Waves recycle

I think only the first two waves repeat and only on castles of the max size, but I could be wrong.

I think it’s the first four waves that repeat. But yeah, the first two waves are the most important, as the Castle Gate could already be down by the time Wave 4 came into play.