@Abhilash Kottakkal I actually think the problem is those new tyres are not suitable for your factory rims. That factory rim appears to have a bead grip ridge on the inside that is to small for the larger bead of your new tyres.
If the bead is not allowed to seat properly every time you lower the pressure you will be at risk of this happening. I would take them back to the shop and see if they can confirm.
don’t worry about getting help, that’s why we are In This club, it’s all about learning and helping each other 👍
Edit: just had a quick look and your factory rim look like it’s only 7.5” rim, right on the lower limit for those wider tyres you have just put on. Might be why they pop off so easy.