Hello @Robby, it is highly recommended to use a current TWRP version, e.g. twrp-3.3.1-0 from 2019-05-20. An update of TWRP can easily be done via TWRP “Install”. Comparison also Install from microSD.
TRWP can usually be flashed very easily with the proven version Samsung Odin3 v3.09 - TRWP (yes, there are also newer ones).
Back to StockROM Android 4.1.2 and then start all over again might also be a solution.
Let us know if you need any help.