I've been sorting content practically since the Sims 3 came out. I get random doubles and some misses altogether whenever I decide to start the .dbc files afresh. I don't know why it happens, but it nearly always does. You might want to find a tutorial, maybe Mod the Sims has one, to turn your .sims3pack files into .package files. I get less errors that way.
Thanks for the answer! It just feels so weird why some items, the decrap fix just creates a copy of it and other items it don't. Cause from what I've noticed both of the "decrap cc" and the "simpack" version work as intended.