Landscape Sculpting Tool Broken After Crash

We were using the smooth brush in the Landscape Editor when Unreal Engine crashed, since the crash we haven’t been able to edit our map.
Using “Sculpt” and “Smooth” tools produce dark concentric circles but the “Flatten” tool still worked. The scale of the sculpt brush had also been changed to HUGE when we first reopened the project.
When starting a new project the tools work fine but we cannot continue work on our existing one. We have double checked all of the settings, made sure nothing weird was selected, and check the materials, etc.