Deck, landscaping construction question

[spence]

Last summer we put up this deck and I transplanted some more mature climbing hydrangea in front to cover the lattice.

I've noticed the carrier beam has rocked a tiny bit on the right side, the posts are still pretty plumb.

I don't think this has to do with the weight of the hydrangea, but was just some settling...

Regardless, should I add some reinforcement to ensure the beam can't move...just to be sure...or is the weight of the deck so much that it's really not going to make a difference anyway?

Thoughts???

thanks - spence