I don't think there is another solution, but if you save your puzzle in what you think is an alternative solution then I'll take a look. Or send a screenshot to gareth@puzzlemix.com.
I have a checker I wrote long ago for Nurikabe puzzles. It doesn't create them but it does solve them. There've been a lot of Nurikabe on puzzlemix (and elsewhere) without issue so it's probably the case that the software does work correctly - and so the puzzle is okay. Plus I solved it again too. So the most likely explanation is that your black squares were not all connected, or a region was not the correct size. :)
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A yellow/light blue highlight in the time distribution charts highlights your time, where relevant.
Rating scores out of 10.0 show the average difficulty rating chosen by users, where 1.0 is "Easy" and 10.0 is "Hard".
If a puzzle is opened more than once, including by loading from a saved position, then this is potentially a significant aid so it is listed as being completed with 'multiple sessions' for the purpose of the best time/average rating displays above.
Minor aid is defined as no more than one use of 'Check solution' when incomplete and/or no more than one use of 'Check solution' when wrong; and/or using highlighting aids (show repeated digits, show broken inequalities and show valid/invalid placements [slitherlink] only). Major aid is any and all other use of the solving aids except for 'show wrong'.
I have a checker I wrote long ago for Nurikabe puzzles. It doesn't create them but it does solve them. There've been a lot of Nurikabe on puzzlemix (and elsewhere) without issue so it's probably the case that the software does work correctly - and so the puzzle is okay. Plus I solved it again too. So the most likely explanation is that your black squares were not all connected, or a region was not the correct size. :)
You can however view other players' statistics and comments in the tables above.