Little help please

So.. My friend owns a server on here, of course. And we're using mods to make it more fun. But we are having A LOT of trouble with it.
The mods we have chosen are Pam's Harvestcraft, Biomes o Plenty, and decocraft. I have got her to download the software things of the mod, but it wont work.
We both use the 1.12.2 version of forge, and we have checked our mod folders to see if we have any extra mods, since I kept getting kicked a thousand times.
At that time we were doing it in survival, so I taught her how to OP people, and so we went in creative.
While I was still getting kicked, she said that the mods were working. But that was only in her inventory.
When I finally got on without being kicked, I went into creative too, and the mods showed up in my inventory too.
But when I put a Ruby Ore from biomes o plenty in my hand, my friend couldn't see it. And when she said she was holding a blackberry from harvestcraft, I couldn't see it.
I placed the Ruby Ore down, hoping she would be able to see it then.. But it disappeared right away. My friend tried putting another Biomes o Plenty block down, but in survival. And.. Didn't work.
Please help!!

I don't, sorry. But I can ask her I guess.