What's the deal with birthday party gift expectations??

Got invited to my coworker's son's birthday (kid I've never met, btw). The mom specifically said "nothing over $25" but then I see the party is at some fancy place with a live DJ and catering. Now I'm second-guessing the $25 Lego set I picked out. Should I spend more? Is she testing me? Why is this stressing me out so much lmao