Analysis Arrow and Variation Bug

I got some really weird results for an analysis. The arrows make absolutely no sense and the symbols are sometimes out of place. It seems like they're delayed, but the delay wasn't consistent either. Also for non-best moves it didn't show the best move. Refreshing fixed it though.

Really weird. Was this just one time or has it happened again? 

It happened before, but 99,9% but it's really rare

Okay; thanks! I reported to our devs to have a look.