Updated to ios 18 but lockscreen widgets are still that of ios 17 (with a square darker background)

So I recently bought an iPhone 15 that was already updated to ios 18 and had the default circular shaped small widget options on the lockscreen (with no dark square app icon background), so I restored a backup of my old iPhone 11 which was running on ios 17 to my new iPhone, and had to manually update to ios 18 from my iPhone 15. However, whenever I go to add widgets on my lockscreen, its showing widgets of ios 17 and not the widgets I initially had when I bought the phone and before the update. Can someone help me find a solution as to how I can access the new widget look? Im attaching the image links here, in the screenshot from a YouTube video, you can see circular widgets of iOS 18 which is the look I want for my lockscreen. And the other screenshot is what I’m getting (iOS 17 look with square background) after restoring backup but after ios 18 manual update. Please someone help me out.

[Edited by Moderator]