https://blog.bitcoinfoundation.org/runoff-election-reboot/
Further info....
https://bitcoinmagazine.com/19401/developing-story-bitcoin-foundation-elections-shambles-candidates-call-restart/
In short, there wasn't any technical problem, but the way it was handled was clunky and required a lot of steps (not surprisingly since everybody voting would have had to register a BTC address from which they were voting), and apparently the guy who decided to go with the plan didn't consult with everybody first and some folks got a little pissy about some of the implementation details such as whose name was listed first in the voting.... ah, politics. Furthermore, some people had valid concerns about the public's ability to see the results in real-time, which could discourage others from voting or otherwise affect the outcome.
The Election result are out at https://blog.bitcoinfoundation.org/election-results/
The irony here is that the "END" results were actually similar to the "rebooted" Blockchain Vote that was held earlier. Going by the results at https://blockscan.com/votecampaign/btcfoundation
Olivier Janssens - 63 Yes Votes
Jim Harper - 59 Yes Votes
Michael Perklin - 37 Yes Votes
Bruce Fenton - 45 Yes
Which basically means both Olivier Janssens and Jim Harper would have made the cut either way, with the first and second most number of votes.