One camp into invade?

Played two games, both games they grabbed their blue then b-lined it into my jungle to invade and fight me? Watching the replay, neither had direct vision on me but one did know that I wasn't at my other buff though.

Not even mad like I killed both of them, one I even lived through. Am I missing some insane jg strat thats recently been popularised? To me this feels like a cheesy coinflippy thing to do?????

This is in the depths of silver (me) and gold (my duo)