Boundaries between classes in classified raster not displaying properly

[GeoffRotherham]

I have loaded 2023 sentinel landcover imagery into an arc Pro project and the boundaries are not displaying correctly. For example, between pixels classified as water and pixels classified as built area several other classifications will be wedged in between or small no value blobs will appear between the borders. These added classifications do not appear in the sentinel 2 landcover explorer on arc online.

I have tried editing settings and redownloading the layer, but it has not helped.  This issue has also happened when using extract by mask on a WorldCover raster layer. Does anyone know what could be causing this?

(I am unable to add a photo to the post)

[SydneyHeathcott]

Hi I'm not sure if you've tried this but running the check geometry tool can help you figure out where the errors are coming from.

In adding pics to the post, you have to save the image and add it via the drag-and-drop (i've included a screenshot of what i mean) images cant be added directly to the text box

[GeoffRotherham · Accepted solution]

I was able to find the issue with my raster layers. The default resampling method was set to cubic for some reason and switching is back to nearest neighbor fixed the issue.

For reference I attached a screenshot of what the issue I was having looked like as well as where I went to fix the issue.