Oh man pop, I'm sorry.
I've got a very similar green house. If them tie down stakes aren't completely buried in the ground it'll take off. I had pulled them up so I could moe around the green house and only put them back in half assed. When I woke up the next morning, it was in the woods. I'm surrounded by woods so the tree line stopped it, luckily. So now they're buried like an inch under the soil line and it hasn't moved since. 60% of the garden plants had to be restarted. I also used some hardier stakes than what came with it and thicker rope. I really think that helped.
I would say don't give up just reinforce.
Good luck