The red arrow shows the point on the saddle you measure the scale length to, the place where the string just leaves the curve of the saddle slot. If you've measured to further back on the saddle, then that may explain why it's a bit further forwards that it probably should be.
Just remember that its the vibrating string length that defines the scale length, nothing else. So don't worry about anything but measuring between the flat side of the nut (else or the top of the zero fret if the guitar has one) and the point where the string leaves the saddle. That works for all guitars and all bridge types.
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