Going into the settings and save/load fixed it....
Hey De_inordinatio! I see what you're saying and I am really sorry you were having those issues. I just released an update that fixed up these bugs and overhauled the system. You no longer need to research the plot management tier to begin expanding plots and they should work as soon as you get the money now. All the bugs you were experiencing with it should be fixed now as well. Please let me know if you have any other errors! Thank you for taking the time to point these things out, I really appreciate it!
Okay, thank you for the input, I can look into this. Just to make sure though, by "last one" do you mean the add plot button? If it helps to explain you can also add a screenshot too so I can better understand the issue.
EDIT: I just pushed out another update that may have fixed your issue, but please let me know if that was not what was affecting you. Thank you for your patience, I really appreciate it!