I may have initiated those yes. Either when making peace they gave me a city and I gave them resources and money, or if I bought resources for units with money. I don't know how long ago they would have been though. I do notice that on the next turn, they change from 25 turns to 24 turns, so I don't think they're stuck. I believe it's most likely I'm getting away with not paying what I should.
Great! a repeatable result. Looks like a huge bug, and possibly open to a huge exploit.I have a test you can repeat yourself on my saved game. I just gave an AI 30 gold per turn in exchange for a luxury. That deal was then listed with the other two, and counted in the loss per turn, but not taken off on the next turn.
It has been reported by others that this happens for the AI as well. Where they have a trade deal with others that should be costing them gpt, and so much gpt that they should be losing money each turn, and yet the AI gains gold each turn. You should report to Firaxis, your save file is a good example of the problem happening for the player.