Long story short, I spent probably a few full days trying to get the exact villagers I wanted with the trades I wanted.

I finally got the toolsmith and the weaponsmith that I wanted after 50+ tries and alot of resources wasted.

I log in today, and it's exactly those 2 that are missing. The most important ones.

I made sure to place their beds not close to any other blocks to they wouldn't disapear, and the door to the building is an iron door, with a button so they can't escape.

There are 2 iron golems in their area and the place is very well lit. 

I looked all over and cannot find them.

And these new villagers i had a distance away, which i was going to make into fletchers, took the workstations of my previous toolsmith and weaponsmith, meaning that they are gone. dead.

So I truly don't understand how this happened and understandably, I'm very upset over this.

Is there any way that a mod or something can give them back to me?

And what the heck happened?

This is ridiculous.