I don't know if this is exactly what you ran into on the site, but what I ran into is an error message that said they couldn't use my PD for that frame, when I entered the PD as a "right" and a "left" PD, but when I entered it as a single PD (combining the individual numbers) it worked fine.
INW, if I entered Left PD=30, right PD= 31, I got the error, but if I entered PD=61, it was accepted.
Mine is 61, wife's is 59. I did the trick where I punched two small holes in a piece of paper at 61, and my wife could see just fine through them, and I did two at 59, and I could see just fine though those.
Any experts out there who could expound on just how critically accurate one needs to be with those numbers. I'm sure my glasses move around on my nose at least a mm or two.