I was watching the ladies Wimbledon final today. 1st Set, 5 games each, 15 points each. Williams?

... returned the ball, mid-rally, to the right base-line but the ball was called out by the linesperson. Williams challenged and HawkEye system showe

... returned the ball, mid-rally, to the right base-line but the ball was called out by the linesperson.
Williams challenged and HawkEye system showed the ball to be IN.
However, the point was not awarded to Williams - despite HawkEye showing that Williams' shot was in - instead, the umpire ordered the point to be replayed.
Why??
Surely Williams was owed the point immediately? As HawkEye showed the shot to be in. I don't get why sometimes it's overruled and sometimes replayed

or:... returned the ball, mid-rally, to the right base-line but the ball was called out by the linesperson. Williams challenged and HawkEye system showed the ball to be IN. However, the point was not awarded to Williams - despite HawkEye showing that Williams' shot was in - instead, the umpire ordered the point to be replayed.Why??Surely Williams was owed the point immediately? As HawkEye showed the shot to be in. I don't get why sometimes it's overruled and sometimes replayed

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