When I got my MBP at the end of 2010 it naturally came with iLife included for free. I later purchased iWork. Yesterday after upgrading to Mavericks I was able to update my iWork apps but I wasn't able to update my iLife apps, it only said that I had to pay for them.I don't think there's anything that needs to be fixed.
If you have redeemed/bought iLife/iWork through the Mac App Store, you can update. If you haven't, you can't.
It now seems to have been fixed and I am currently updating my iLife apps.
Also hasn't iLife been free for a number of years now and pre-installed on all Macs? If so why has it even been in the MAP with price against it?