Why does an amount come.off am invoice when I save it without me adding a payment ?

 Hello Stephen-hones-ya, Welcome to the Community page,  So it could be that you have a credit note which is auto applying and that is why it is taking the amount off when saving it. I would suggest you check your settings in the main cog wheel and see if the auto credit note setting is turned on as you may want to turn this off. Main cog>account and settings>advanced> automation> automatically apply credit