sometimes blocks randomly turn into stone on my server. this happens when you get quartz outta gmc or sometimes when you middle mouse button a block. please help
For the middle mouse button a block: Anything from chunk corruption to large Worldedit actions can cause this, you should try resetting the chunk the blocks are causing trouble at. As for the quartz to stone thing, I have no idea but it may be a plugin?
It often is version related. For example if you try to middle click a brown glazed terracota in 1.8 (which looks like quartz), since this block doesn't exist in this version you'll get a stone block (the default one) I hope I'm understandable.