Did you buy the laptop as new, 2nd hand or refurbished? Check your orders and see, you may have bought a refurbished model .
1 year warranty is a bit pants in the first place.
What are you using to calculate the warranty? If it is based on the serial then the system will work off when the unit was built rather than sold.

I would defo phone them mate, buying it new it should be perfect.
Not quite that simple unfortunately https://support.lenovo.com/gb/en/documents/migr-69226
I agree, so why is Lenovo saying my warranty has expired? I will give them a call on Monday but tbh I'm not sure if I can be bothered with returning the laptop just for a few dodgy pixels that I hardly notice.