I went to Xur, saw he was selling "Cerebus+1" and was hyped to get it. When I clicked buy nothing happened, so I went to orbit and back, and he was suddenly selling a different weapon "Riskrunner"...
I ended up buying riskrunner, but am disappointed as I'd much rather have cerebus+1, and other people could still buy it even though I could not.
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Yeah, I am actually rather irritated because I already had the Riskrunner after getting the bloody quest for it, but I have been wanting the Cerberus +1 for so bloody long now. Shafted by a bug, yet again.