Real Estate involves land. Land has worms and other critters. I think they (maybe night crawlers) are  coming up out of the ground and browsing in your pixels. They probably like 1s better than 0s, since they look more like blades of grass. I don't know the cure, but I am pretty sure it is some type of critter getting in there and eating you 1s. They never heard about Cheery Os!

I have used Lacerte for as long as it has been around. I, fortunately, have never experience anything like this. I hope it resolves itself. I really hope you can figure out WHY?