Can't make a selection or use drag handles

I know this has been mentioned but it’s causing me problems and I can’t find the answer. I have a base with quite a few tables. In some of the tables I can make a selection, as in drag the curser over a bunch of cells and it will select them, like it is supposed to do. In others I can’t, and I have no sorting or groups on, it just won’t let me select anything, and also won’t let me use the drag handles to populate multiple cells in a column like I usually can. There is something preventing these in certain tables and not in others but I can’t for the life of me see what it is. Would having multiple views in a table do that? I need that feature to work