Creative Core:1.9.22
Little Tiles: 1.5.0 pre94
Forge:14.23.0.2515

When placing a Chair type structure on a non standard (default minecraft) height block, your location when sitting will be below the chair (you'll be basically sitting on the floor). It only happens between the tile heights of 5 and 15.

To illustrate:

The first two work fine as they are between 1 and 4 height:

The other two don't work as intended:

That red line in the middle is the red part of the chair. I can't take a third person picture because it's just a closeup of Steve's head.

P.S.: This was tested with 16 grid structures. I don't know if it happens on 32 grid or higher.

Seems to be mod trying to mount Steve on chair inside starter block. (Where chair model bottom layer is located)

Thanks for reporting this issue, will be fixed in 1.5.0pre95 (should be available soon).