Accounting generally wouldn't depict it this way, and it's quite confusing with the bubble diagram. I always found it easier when looking at things called "t accounts" [1]
Anyway, for the example you mention, it's supposed to mean that it takes 5k from the bubble on the left (founder) and gives to next bubble (bank)
Then each line again takes from left and gives to the new bubble on right. So each line is a transaction that balances out by adjusting both sides.