Distance Field's 'Distance to Nearest Surface' Has a Maximum Distance?

I’ve encountered a weird issue: I’m using distance to nearest surface in my material to control colour, amongst other things, of water, and have found a weird issue wherein after dividing the node’s result by the distance I wish to transition in - if that distance is over around 350cm, the result is always less than 1.
This makes me think that distance to nearest surface has a maximum value of around 350cm.
Is this true, and if it is - why is it so?
It’s infuriating.

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It’s not my blueprint - you should be able to see the same results if you plug distance to nearest surface / 1000 into colour, it should remain grey after a certain point. (Around 350-400cm)

What function is implemented division? Can you attach a screenshot of the node or code.