Well, the database stored all 10 attempts you made to enter your last fill data
But in one of those 9 you had put in "29436" instead of "294.5" miles, thus the resulting 169 mpg 90-day average.
Anyway, I've deleted those 9 duplicates.
To update your graph & 90-day value to reflect reality, just go in and edit/resubmit your latest entry.
Not sure what went wrong, but the fact that the database entries were there makes me guess it was a temporary glitch in the image writing code that updates the fuel log chart.