The average data is correct, but the 5 Second Report is all over the place.
...
The variance on 5 Seconds should be high.
The 'average' takes time to level out, probably an hour or two.
As I've mentioned before somewhere ... I once had something like a 1 hour runtime on an S3 average around 150% performance due to variance.
Shares are statistical results, so expecting them to provide short term consistent averages is simply misunderstanding what a miner is doing
(or fudging the data)