minecart w/ hopper disappearing when coming back from nether

recently I've been noticing my hopper w/ minecarts from my farms disappearing after coming back from the Nether to the overworld. It's been bothering me a lot, I've been having to craft hoppers and minecarts again and again when it happens.. (also using up iron)  I've been going to the Nether a lot for transportation. if you could fix this issue it would be much appreciated thank you

(also, I'm not sure if it's just me with this issue)