Sims 2 missing sims tombstones

My Sims 2 have issue with missing tombstones. At one time vanished multiple tombstones from one graveyard.

I placed them day before, saved, checked them with normal view and they were there. The next day while checking they were gone. Most of them were very old tombstones like Mortimer Goth one. What is even more weird the tombstones which went missing were like going from family only - it was like certain surnames gone missing.

I lost Broke tombstones, Goth playable ones tombstones since old pre-game dead were not touched by this glitch, I lost one by one Travellers tombstones (family from Vacation add on), Hook's tombstones, Pleasants tombestones along with adoptive parents of Mary Sue tombstones.

After counting I can say that at that ONE moment 23 sims tombstones vanished. All were in the same graveyard located directly in Pleasantview itself.

I know what's going on - it was some sort of corruption of data. That's why I need help from tech support. I need to know HOW can I get back those tombstones - how can I deal with corruption of those sims data ?

Especially if most of the missing sims were for quite long time dead now. Entire Goth family is dead in mine city like for half of this year. And yet they still got missing.