I was looking at the recipe for the Golden Pull-Apart Butter Buns, and I noticed something weird in the conversion between volume and weight. In terms of volume, the recipe calls for 2/3 cup of water; in terms of weight, it says the equivalent is 5 3/8 ounces of water. So my first question is, does "ounce" here refer to fluid ounces or dry ounces since the former is actually a unit of volume, not a unit of weight?

This conversion makes sense if by "ounce," you mean "fluid ounce." There are 8 fluid ounces in a cup, so 2/3 of a cup is equal to 5.333 fluid ounces, which is pretty close to 5 3/8=5.375. In terms of dry ounces, 2/3 of a cup of water weighs 5.563 ounces. So it appears that even when you ask the web site to give you weights and it appears to convert the amount to a weight, it's really still giving you a volume measurement.

But then what about other liquid ingredients, like honey? If a recipe calls for 3 ounces of honey, is that 3 fluid ounces of honey, 3 dry ounces of honey, or the amount of honey that weighs the same as 3 fluid ounces of water?

Finally, the KA Master weight chart equates 1/3 cup of water with 2 5/8 ounces and 2/3 cup of water with 5 1/4 ounces. Neither of these seems to be correct, regardless of whether you're using fluid ounces or dry ounces. (The differences are small amounts of water so it probably doesn't make much of a difference, but it would be nice if the conversions were consistent.)