When Matt from Obsessed Garage was testing soap ph levels hyper wash acted the same way. It rose in ph when diluted but the other soaps he tested fell in ph when diluted. He called the chemist from P&S for some advice and the chemist basically said the hard tap water he was using could be a factor. Matt ended up mixing it with distilled water and got the same result. I'm guessing since hyper wash was formulated for commercial car wash metering systems it acts this way by design.
I have watched that video a few times. He also has a great article about pH levels on his website -
Deep Dive Into pH In Car Wash Soap | Car Soap | Obsessed Garage
I too have noticed some weird things regarding soap pH levels in the past. I have had people try and explain this to me a few times, including from the company who is responsible for the soap below. The consensus being that not all pH values are the same, that the specific chemicals used play a part in how that pH value acts.
When I first started testing pH values, mainly as a reference, I noticed a huge discrepancy in the quoted and tested values for the two NV soaps. Now, I had always been a huge fan of these soaps, they foam like champions, are affordable (for us at least), offer near Reset levels of lubrication and slickness, all teamed with exceptional cleaning ability. I always noted how much better Snow cleaned compared to other pH neutral soaps, including Reset. The pH testing confirmed what I had experienced......................
NV Snow -
Quoted pH Value - 7.2
Tested pH Value (Concentrate) - 9.26
Tested pH Value (Diluted) - 9.77
NV Snow+ -
Quoted pH Value - 8.1
Tested pH Value (Concentrate) - 12.05
Tested pH Value (Diluted) - 12.08
For reference, Carpro state that Reset is pH balanced, although we know it cleaners better than the numbers would suggest, which again points to not all pH values are the same.
Carpro Reset -
Quoted pH Value - "Neutral", ie 7.0
Tested pH Value (Concentrate) - 7.51
Tested pH Value (Diluted) - 7.52
Those NV numbers suggest that they would destroy traditional waxes and sealants in short order, but having used them on waxed vehicles for many years, I didn't really notice that. Again, supporting that theory of not all pH values are the same.