GIMP Version: 2.8.14
Operating System: Windows
OS Version: 10
GIMP Experience: Intermediate Level

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I recently upgraded from a previous version of GIMP to 3.0.4.

One of the weirdest problems (among a few) I have encountered is that part of the image blurs when I scale downward.

I start with, say, a 1200x1200 px image and scale it to 600x600. The top third or so of the image goes blurry; the rest remains clear.

X resolution and Y resolution are at 300 pixels/in
Interpolation set to Cubic or None gives the same results

Any ideas? I'd post links to images, but I'm too new.

I got help on Reddit, so the initial problem is resolved. I had an effect (Gaussian blur) connected with my layer.

I still question how that got there, so that I can prevent it from happening in the future.

It can only get there if you applied the gaussian blur filter. It does not happen on its own accord.

When you apply a filter that will become a non-destructive-effect (nde - that fx icon) there is a check box to merge it straight into the layer (1) If you forget or leave as a nde then clicking on the fx icon comes up with options, one is a merge (2)