It is actually not known if this construction is leaning by style or for another reason. Even though the edifice leans, the pinnacle in the temple is perpendicular to the ground. While major Hindu temples are encouraged at sangams (confluence of rivers), river banking companies, lakes and seashore, Brhat Samhita https://hanumanmandiradelaide.com.au/the-unique-features-of-hanuman-mandir-south-australia/