Duplicant Stuck By Repeating a Task

I was playing ONI and I found a bug. One of my duplicants where picking up dirt to deliver it somewhere. They would pick up the dirt but would not compleate the action, for a description, step 1 locate dirt, step 2 move to dirt, step 3 pick up dirt, step 4 Error; return to step 3. I think it was an Error and I had seen this before but it was usually a quick fix, by clicking on the duplicant and having them move but this time they did the same thing, step 1 locate dirt, step 2 move to dirt, step 3 pick up dirt, step 4 Error; return to step 3. This kind of error, for me anyways, usually happens when you have over 30-40 Dupes. I only have five (5) on my map.