The somewhat flimsy inciting incident for the Guardians' latest adventure is that Rocket Racoon decides to steal some of the super-powerful batteries the team is hired by the Sovereign to guard. Understandably, the Sovereign are quite upset by this, and they proceed to chase the Guardians from one end of the galaxy to the other in pursuit of the batteries (as well as vengeance). This is all well and good, except for the small fact that Rocket should never have been able to steal them in the first place.
We see throughout the movie that the Sovereign are very technologically advanced. This is made most manifest in their remote control drone ships, which allow them to safely explore and fight their way through space without truly risking their own lives. Such an advanced race should have been closely monitoring the Guardians before, during, and after their dramatic fight to save the batteries (probably by using a remote drone). And considering that the Guardians bring the batteries to the Sovereign, Rocket would have had to steal them more or less directly in front of a group of paranoid aliens…the same aliens that were able to catch Nebula when she tried to steal them in what was presumably a much sneakier manner.
Ultimately, it makes perfect sense that Rocket's theft gets noticed—what makes no sense is that Groot knows how much time has passed before someone bothers to scan the very prize that the leader of their entire race has determined is so damn important that they have to hire outsiders to protect it.