Check the display options in the contacts menu. You might have saved it to sim and the display option for sim is unchecked.
Open phonebook>left menu button>display
Android is really easy to use, granted a few things are different than the previous trend but it gets the job done better. It just takes a while getting used to it.
Samsung GT-S5830 Galaxy Ace
ROM: AOKP 4.2.2
Scripts: CronMod INT2EXT4+
245MHz - 800MHz, SmartassH3