The “whipsaw” isn’t so surprising.
The conditions of each test aren’t clear but even if each test was done in the same conditions by the same people (the technology used can make a difference), there still are random-looking variations.
What is more surprising is that none of your results are high.
Do you have a reason to think your uric acid used to be higher (possibly you used to be fat or you used to take a drug known to raise uric acid)?
Another explanation is that you might have misread the test (that’s not uncommon apparently). There are three different units in active use. 720 or 0,72 is quite high for instance whereas 7,2 is merely borderline.
What is the basis for your gout diagnosis? Merely the appearance of your foot or did a test actually prove you have gout?