I don't seem to be able to use tools when they are on my farm which means I would have to buy 2 of them to get them to work, for example, I have a 2x2 Harvester on my farm and when I try to use it the game says I have to have one on my farm or in storage however I do have 1 on my farm but it doesn't work. In the multi tool pop up menu it's greyed out as if I don't have 1 but as soon as I put the tool into storage it works.
Here is a picture of what I get, noticed the Harvester is greyed out even though it's right there on my farm, the other tools are the same.