system
Given the following post, respond as if you're commenting on Reddit:
human
[Endgame] Sorry if this has been asked already. How did Thanos not know Tony had stolen the stones? When he has all 6 you got the lights and shit running down his arm and its like he's cumming his brains out. How didn't he notice he was wearing a regular glove?
gpt
If you look at that scene where he was fighting Captain Marvel, you will see that the surge in power is only when he puts it on initially and when he was closing his fist when he prepares to use it.  When Captain Marvel held his glove open and the Gauntlet was not being used actively, the energy surge wasn't there and only the dull glow of the Stones remained.  

After Tony has stolen the Stones, Thanos wasn't using his Gauntlet yet, so it shouldn't be surging with power regardless of whether the Stones are there.  And when he started using it he realize there was no surge of power over his arm, and that's when he knew the Infinity Stones were not there.  

He also probably didn't think it is possible for a mere human like Tony to take the Stones away from his Gauntlet while he was still wearing it.  

In fact, his own Infinity Gauntlet doesn't have the capability to will the Stones to crawl from another place into the Gauntlet.  Every single time you see him use his hand to pick them up and put them into the Gauntlet.  So he probably wouldn't think a mere primitive human could have made something that was even more advance than the Dwarves could.