Noticed that when placing blueprints on our server they don't sink into the ground properly they seem to stop at a level and then "jump / miss" a few inches.
I did try it with a construction block and they are working as intended.
A quick video that shows what is happing to
I can confirm that this happens sometimes if collision for blueprints is enabled... we will fix that, but in the meantime you could disable "collisions" in the blueprint radial menu to prevent this from happening 
