Greenhouse foundations were most likely placed over non-native soils/ground. If you can, you could undermine (remove) the soils/ground below the foundation (footings). Try removing ground below foundation at door going to a depth of 5-6 feet depending where you live (check frost depth in your area) - remove all organics/top soil- going a least 5-6 feet beyond both sides of door openings (try not to remove more than a couple of feet in width at a time to the required depth to avoid any collapsing of the footings. This will only work if the footings have been poured on site in a continuous strip (below exterior walls) or if a slab-on-grade pad was put in place - not for any kind of blocks etc. Try not to loosen the ground too much at the bottom of the excavation, fill void to underside of footings with or batch your own. Try to get concrete product with a high slump (600 mm) - non-vibration/self-placing mix so it finds it's way in the void and underside of the foundations. As for the bent frame.
...Now, it could also just be a lack of support over the door opening due to load. Check and see if there is a proper lintel (header) above the door support by doubled jack studs. This fix would be a whole lot cheaper.
Good luck.
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