Ugh, thank you @Egor. The file is odd... I have to separate the art for printing on a metallic substrate with a white underprint in some areas to allow some areas to have the metallic show through and some block the metallic substrate. The blue actually = white. It's pretty confusing but how the printer requires it. Glad to know that the end result / overprint preview shows it accurately... I did not think to check that. Thank you for your response.

Michelle, this is a weird file. It has a black background underneath, and cut holes in blue rectangles. Maybe your process requires it though.

But the problem is just a GPU rendering one, I see it. If you disable GPU (or just set Overprint Preview mode, which you definitely should when preparing anything for printing), it will vanish.

Still needs fixing!

This has been happening to me repeatedly for months during different applications of using the pathfinder tool. Usually with using the exclude option. A part of a shape – in the attached case, outlined letters – will be partially filled even though the path shows that they are not filled. It also doesn't seem to matter if I subtract the shapes using the Shape Builder tool or the Pathfinder. I still end up with color filling areas that should be subtracted and the path shows that they are subtracted. This is a process I use for separating files for printing and it is extremely problematic. When I save the file as a PDF, the issue disappears however some printers prefer for an AI file to be supplied and I don't know how it will end up looking on their end.

I have had similar issues with outlined shapes and fonts without using the Pathfinder or Shape Builder tool. Upon being very zoomed in and seeing a fill not inside of a path, like slightly outside of the path or with gaps on the path.

I expect fills to be inside their path whether I'm zoomed in or not. I need exactness in my vector files.

Illustrator 2021 version: 25.2.1
MacOS Big Sur version 11.2.3

Danielle, it looks like GPU Preview issue. Try to change the mode: View > Preview on CPU and see if there's any difference. In any way, please send the file that has this text to the sharewithai@adobe.com fort hte team to investigate.

I'm trying to block out this outlined text from this green rectangle, however, it is producing a very weird and seemingly glitchy result. Here are my steps:

1) Select both shapes (The white shape appears to have a thicker selection outline? Not sure why that is..)

2) Choose Pathfinder > Minus Front.

3) The final result view cuts off the top of the 'M' and 'R', but the anchor points show a normal effect.

Any thoughts?

I am having the same problem!! Did you figure out how to fix it?!

Is GPU preview on? It sometimes leaves artifacts like this one you show. Try to switch to CPU and check again.

Sometimes a portion of my shape will look cut off. There is no vector information generating is, it just renders it that way for some reason. Examples attached:

Came across a weird file/result that co-workers were able to replicate.

1) Mojave 10.14.1 and Illustrator 23.0.1
2) Selecting two shapes/pathfinder window/unite
3) Letter p remaining knocked out
4) Letter p featuring a slash across the top
5) I've attached the file before uniting with pathfinder

I was able to workaround by simply not uniting but thought ya'll might be interested. Thanks!