Reason for doubled games - that game you installed isn't for your phone (when you try start game - phone restarted ) - try reinstall all games,when you ask for replacing - yes and than try to delete (maybe you have to do that few times)

And for firmware (higher number,letter - newest ) , new firmwares usually some bug fixes

Choose by yourself firmware for your phone (MAIN and FS must be same version number -
like your r8be0001_RED53 and FS -CUSTPACK must be same region - for that look here
Top Sony - Languages Description )

Like this combination:

MAIN:W580_R8BE001_MAIN_GENERIC_LA_RED53
FS : W580_R8BE001_FS_EUROPE_2_RED53
CUSTPACK: HB1-06_Gen_CDA102568_11_R8A_GENERIC_EUROPE_2