well, i am not exactly sure, maybe you read your income wrong, perhaps you are making 5k.. but you didnt scroll down and look at your expenditures which seems to be -10k and then below that you get the total which is -5k
if that is the case, check what you money is being spent on, if it is your fleet, you need to disband all your ships, you shoulod never keep ships on you unless you are going to use them soon, or wont spend turns while you have them. becuase upkeep on the ships is just way too much, especcially for a new empire, to maintain.
but if the case is your total income says +5000$, and when you spend turns you lose 5k, then i t could be a bug.