See the URL provided. Notice that the total number of bugs in the Suggestion summary field does not sum up to the total number of recognised bugs (9 vs 14).
Also notice how the Average position for the correct suggestions: is 1.07, when it should be more like 1.2. Another user even had a value less than 1! (not possible, since you can't be higher up (ie lower number) than the first position. Could it be that the calculation of the average position includes spelling errors with _no_ correct suggestions? They have the position value '-', which could explain the numbers seen.
The percentages seem right, though.
I used the KAL test results, since it contains so few typos right now, which makes it easy to spot calculation errors.
The "Average position for the correct suggestions" bug was fixed in:
The other bug ("Total number of bugs") is still not fixed.
The "Total number of bugs" bug is fixed in https://github.com/giellalt/giella-core/commit/9ca30d3fb582e6585f13a6ec725bcb903d62cb44