Hey there,
I'm pretty sure I already made a thread about this, probably on GwGuru back at the time..
Anyway, my friend got back into Gw1 after many years (8+) and he got some ELs from 6th birthday presents. But here's the thing : they don't stack with each other.
I always stacked all the tonics I had, but for his tonics it doesn't work with any of my or his tonics, I'm not sure why.
Did it happen to anyone else? Did he find something extremely rare worth $3,541,685,165,174? (I told him he did so you better save your money for his tonics!)
Let me know what you think
Edit : Oh and here's another weird thing : 2 of his tonics stack but the rest don't. (Of course I'm talking about 2 of the same kind of tonics stacking)
Edit 2 : All tonics are from 6th birthday presents, none from vouchers. He traded all his vouchers for 7th Bday presents.