Partial rendering of shapes

I’m playing around with a minecraft mod. I’ve set it up to shoot a red square when I right click… but depending on my viewing angle the squares become partly invisible(some pixel render and some just don’t) or even disappear.
I’ve got face culling turned off and lighting turned off as well.
The orientation of the shapes relative to my view point doesn’t seem to matter, if i move my mouse a bit and change the viewing angle all of the ones i rendered have the same issue.

I made my squares travel a short distance and stop so you can see what going on.
Any idea on what kind of settings could possibly cause this effect?

I have a screen shot but apparently i’m not allowed to link it.

The screenshots are at