i have a problem in my j7

i recently installed j7 ''ROM][J7][Stock] Stock Custom ROM debloated and deodexed and Optimized'' after installing that i found that official firmware is best for j7 so i return back to official firmware and i found a problem in my j 7 that all my contacts was shuffled up (eg. two contact jhon diggile ,william henry they were shuffled up and i found jhon henry and william henry) is there any way to fix this ...... i know that we have great developers they can help me fix it :):D