In my sigelplayer world a have an strange thing that allways happens.

I have a bunch of villager cells and on the floor i have slimeblocks to make an duble villger cell but the lowest one that are standing on the slimeblock
i can't trade with him i see the trades for like 1 sec and i can't trade with the villager.
The issue is only happening when the villager is standing on the silmeblock.
It feels like when the villager is on the slimeblock he is lower than a normal block and thats why he don't want to trade with me. Please fix it i want to be able to have an duble villager cell and acces the villager that is standing on the slimeblock.