if you examine multiple bundles of the same denomination with the scanner, instead of updating to reflect what's in each individual bundle, it will show the same information as the first bundle you examine. as the image demonstrates with a collectible bill in the top left bundle, if you start from the top left, all other bundles will show as containing a collectible bill. if you start from any other bundle, the bundle with the collectible bill will show as a normal bundle.
i've seen this happen with marked bills as well. however, the scanner does properly update across bundles of different denominations. this is in v1.5.1.961.