Using Forge 2095
SignPicture-1.10.2-2.3.0-universal
Without optifine

I am getting some weird issues after placing a couple pictures.
My inventory is full but it shows up empty, if I shift my field of view the inventory shows up fine again. So it's only when looking in a certain direction.

Related but different is, that when looking from a specific angle the already placed pictures move with my mouse movement, as well as all other particles on screen. Hard to describe, it's almost like the preview mode, but after a certain angle the pictures snap back to the place they belong.

Thanks for reporting!
I think that your console has prompted a warning of a lot of GL error, but the bug in this update will be fixed!
Also fixes inventory of drawing bug.
New version is Available!

Fixed, thank you!