I get this strange display error showing fill colour outside of the path of an object I am working on (please see attached image in the top of the letters P, E and N). The text is around 1 mm (0.04 in) in height and this display issue changes when I enlarge it to a larger size (it still remains, but is less visible as the fill does not stretch as far outside the path), so it seems to be related to the size of the paths. The text is not white paths placed on top of the purple rectangle, but rather a subtraction in the rectangle using the pathfinder.
I have tried to to expand the paths, unite it with the pathfinder and I have also tried to compound the paths. None of those actions solves it. I don't know if it's very visible in the attached image, but the edge of the fill that ends up outside of the path is not compltely smooth, but rather have a pixelated transition as if you would draw a diagonal line with the pen tool in Photoshop (that's the best explanation I can think of), so it looks more like it is an software issue as edges normally never display like this in Illustrator otherwise.
I just updated Illustrator to 25.4.1, and the issue still remains. One of the attached images shows what computer I am using if that have any relevance.
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Does turning off GPU preview (View > Preview on CPU) affect it?
Yes, that was the solution I found in another thread just when you wrote this.
I found this thread where someone suggested that I should change View to "View using CPU", and that actually solved this.
But do anyone know what it happens when I view using GPU?
It happens because it's a bug in the GPU preview. If there's a more specific 'why' than that I would love to hear it.