[Chevy3+3]

Its a normal thing for the two squares I've had. I could be wrong but I think its more common on 81-up. The hoods were weaker in the front center and allow them the outer edges to rise at highway speeds and flap like bird, lol. Both my trucks eventually cracked the metal on the very center of hood from the stress of flapping. In my opinion the front hood structure wasn't built heavy enough

So to answer your question.......Its not just you, lol