Thank you for your review! High heat sterilization methods, like a steam sterilizer, will most likely cause the silicone parts to wear out faster and you may even see the hard plastic pieces begin to warp. This does explain the warping you are experiencing with your parts!
As communicated on the product page and in the Imani User Manual, we recommend sterilizing the parts once before the first use by submerging them in boiling water for 3 minutes. During this process the parts should be actively monitored to avoid any accidental contact with the sides or bottom of the pot.
Non heat methods, such as UV sterilization, or cold water sterilization (Milton tablets), are also great options. After each subsequent use, they can be washed by hand in warm soapy water. If any additional sterilization is needed, we recommend using non-heat methods!