EC issue

So I watered yesterday in canna coco and the run off EC was a lot lower ranging from 0.38 - 0.77ec

The input EC was 1.2

Is this something I should be worried about? They look healthy overall but I’ve always read that the EC should be a tiny bit lower than the input but not this much.

Pic attached.
Thanks

If you always feed to substantial run off, checking the run off is unnecessary.
I never check my run off.

I quit checking runoff a long time ago.