Sprite Packer increase Batches?

Hi,

I'm trying to optimize my game. Just come across Sprite Packer and I'm confused of how to use it properly.

Specifically, before using sprite packing, the stats is the following (notice the 13 Batches and 11 Saved by batching)

But after sprite packing (using 3 packing tags), the Batches stat increases to 15, and the saved drops to 7!

I'm thinking I'm misusing the sprite packer. Please help! (If you want any more information, please let me know).

Thanks in advance.