I have been playing with the settlement builder and I came across an issue I can't find a solution too. I have seen a few other people have posted about this issue and have not gotten a good response.

I was building defenses when I noticed I could not build any more basic turrets, strange as I only had 5, I have everything I need to build them and my limit bar is only 80% full. This is the first settlement I have really built in so a world limit is not in question. I left it alone and went on building other things. Then I decided I wanted a water purifier... Nope can't build that either, I still have everything I need to build it and I have the space, my build bar is not even close to being full. I linked all my settlements to a hub in sanctuary. I went to several settlements and still can not build either of these items. I deleted a turret hopping that it would allow me to build it again and nope. Now I even have one less. I thought maybe it was an issue with the items in the workshop not being counted correctly so I pulled out all my junk and dismantled it all into raw components and tried again... Still nothing. I'm at a loss. I could have substituted the turrets for other ones but the purifier is important. Any ideas or known solutions?

Update I:

I noticed that even while the supply lines are connected and this allows you to borrow materials while building, not all the resources are collectively available at each workshop. I systematicly traveled to each settlement, withdrew all junk, dropped it on the ground and scraqed it to raw materials. After all was scraqed it allowed me to again build one turret and the problem continued.

Update II: Solved... Sorta

I collected all the raw materials and brought them to one central location, this did not help. I did notice the items I could not build had a few raw materials that I was low on, still technically enough to build the item but just enough. I decided to go shopping a buy more of these materials. After I had a surplus of these raw materials I was able to build freely again. Seems the glitch is a counting issue, when in doubt get more.