Why is WTI crude oil more expensive than Brent ?

What makes WTI crude oil more expensive than Brent crude oil ? Usually Brent used to be more expensive than WTI.

Yes, Brent crude oil is usually more expensive because it is extracted from offshore oil fields in the North Sea.

But currently, WTI crude oil is more expensive than Brent, because of short-term supply shortages and conflict in the Middle East.