Upon creating a blueprint with turrets, the placement of these turrets is always shifted by a block in certain orientations and obstructs the rest of the blueprints to be created. It's no issue with the 1x1 mini turret, but both the 2x2 turrets behave this way. It seems as if the issue is the anchor block on the turret on which the turret gets rotated instead of getting rotated at the center of the structure. It makes sense as you usually place the turret on one tile and the other 3 tiles are "dummies", but if you rotate a whole blueprint, the anchor point seems to stay in the same orientation (as the turret is a non rotational structure) and therefore blocks the rest of the blueprints.

I also noticed, spike traps also have a rotated blueprint, although it's a non rotational structure either. Although this is purely a visual "bug" at best, I wanted to mention it in case it bears any relation to the more significant bug of the turrets.

If you please so, I can prepare some screenshots or the blueprint itself that shows the bug if it helps to clarify the issue.