no items being dropped and add-on tinkers construct does not work

I was playing on A created world of mine and I added three mods it was the gravestone mod that hikers friend mod and the tinkers construct mod everything seem to be fine but I started to notice mobs don't drop anything anymore and once I Build the tinkers smeltery the big smelter in the pack it didn't want to work it was only the little smelter. I tried to remove some and tested them, all three of them in the same world just them alone But it still didn't work.