Those springs look pretty flat compared to my new front AD springs (but don't know how much yours are loaded), and they are definitely too long. The shackle should sit close to vertical, so normally arched springs have somewhere to go as they flatten out and the length increases. Those look like they'd bind up if you hit a good bump and may actually break something.
Yep, someone stuck AD springs under your truck.
The Filling Station carries new springs for your truck for ~$400 a pair, or a local spring shop might be able to get them for you for less $.
