This isn't a photo album includelet thing per se - it's more that Background Begin/End are designed to overflow the bounds of the column they are put into, and so using them in a multi-column layout won't ever behave as you want it to. They work best on linear pages where all includelets are put into the main Content column.

The photo album includelet would work perfectly well in the main column too, of course, if this is your preference! Then you could separate it with a different background colour if you like.

Thanks

Joe