I have two issues that have two ad pages inverted. What’s odd about this inversion is that one of the ads resides on the inside of the back cover. The other ad resides seven pages from the back cover.

1^st ad: A full page spread of “Indiana Limestone…”

2^nd ad: A full page spread of “Pyrene Kills Fire…”

Again, one of these books has the 1^st ad on the inside of the back cover and the 2^nd ad seven pages from the back cover. The other book is the exact opposite with the 2^nd ad on the back cover, and the 1^st ad seven pages from the back cover.

Any thoughts?