Ok this is strange...
I was playing on my realm and then when I pulled out my redstone lamps they started disappearing! I will quickly give some info

This strange behaviour only happens if the redstone lamp is above a block of redstone leaving me to believe that when the redstone lamp powers, the powering of the lamp overrides the placing of the next, therefore deleting it

This also only happens in creative.

This bug is incredibly annoying and I would appreciate it fixed also on this website, when you type a comment on mobile. It types backwards, that could also do with fixing