Transforms and their quality

Hi!
We’ve noticed at work that any kind of small scale up to an image (I’m talking 2k) generates a checkerboard pattern to it. Let’s say I scale up the image by 1.005, the image is scaled up but if you zoom in you can see this sort of grid or checkerboard pattern on it, it seems that some pixels are scaled up and other are left the same …
I’ve tried all filters and to get rid of the problem using all possible nodes:

-Transform
-Card3D
-iDistort
-CornerPin
-Reformat
-GridWarp
-STMap
-Card and scalineRender

Anybody knows about it?
Thanks to all,

.p!

:happydevi

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