Pattern turning into stripes

In illustrator the pattern I have turns into a stripe of the same color as the pattern every time I zoom out. It seems just to be a preview issue, for example if I export the file the pattern looks fine and if I zoom in enough it turns back to the actual pattern. In the swatch box I can also still see the pattern looking normal. Sometimes the pattern will look the way it should but I'll move around in the file and it'll turn into a stripe all of the sudden. I've tried it on different file sizes, restarting AI, saving a different file etc and it happened everytime. It seems fine with other pattern swatches. I make patterns all the time and this is the first time this issue has happened. Is there a way to fix this? Any help with be great, thank you!