Retirement tax questions

This year i followed the instructions to do it within the IRA question and it did generate the 8606.  However it had seemingly random numbers on it, that i have no idea where it came from and no way to find out.  It changed my taxes in an odd way when i put in what i thought are the correct numbers.  I've always done it by hand before as part of the taxes, and i have no idea why it has these weird numbers.  Like telling me i took an RMD much larger than i did.  Any way to find out where these numbers come from?