I noticed within the past month everytime I open a design table all of my cells in there get some sort of Data Validation to it and so when I go to change it I cannot. I have to go in and highlight all the cells and remove the data validation that was placed in there. Then when I open up the same design table 30 seconds later, the data validation is back in every cell.

Is this a bug or is this a feature that I can disable?