Odd behaviour with dimension

Hi there.

I’ve noticed this odd behaviour as shown in the video. I’ve created this right angle bracket, and when I measure from a bottom corner to a top corner vertically, the dimension is as it should be, 84mm, but if I measure the dimension from the bottom flat face, which should be on the same plane as the bottom corner points, the dimension is slightly less than 84mm.

Does anyone know why this is happening? I’m curious to learn more than anything. I’ve attached the video and the model itself. Many thanks in advance for any help that can be provided. Paul

Measure.skp (177.9 KB)

@MelbourneApart, the bottom face doesn’t appear to be flat (all Z values zero)
Look at the red coordinates in the image:

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Thanks Wo3Dan. I wonder how that could have happened. Cheers. Paul.

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