The pages 2 and 6 are related to each other. If you change the settings for 2, you also change the settings for 6.
If you load the book, watch the name of the Mount Page 2 Small, you will see the name of the "video" is V06
Change that into V02 and you will see in Mount Page 6 Small, thgat name there is changed into V02.
This means, that Page 2 and 6 are incorrectly defined in the Effect. They can not be "separated" from each other, as far as I have tested.
I have delete Page 6 and made a new one from a clone (Page 5). Adjusted all parameters and that works OK.
See the modified Wedding Album here.