Tier 11 war with tier 9 nodes

My alliance is currently in defence placement mode and we are at tier 11

However as we are placing our defenders we realize the nodes are not the usual for tier 11,more like for tier 9

Anybody else facing this? Would like to know if this is a bug or because our Opponent is in tier 9 hence that is why the nodes are from higher tier

However as we are placing our defenders we realize the nodes are not the usual for tier 11,more like for tier 9

Anybody else facing this? Would like to know if this is a bug or because our Opponent is in tier 9 hence that is why the nodes are from higher tier
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Thanks for the info...never match against higher tier Opponents in previous war so got a little confused with the node