Measurement discrepancy on vfrmap dot com sectional -- is the grid wrong? At Nome Alaska-- KOME-- the E2 airspace (dashed magenta line) is listed as extending 13.2 (nautical) miles east of the airport-- according to this source page E-9 -- https://www.faa.gov/documentLibrary/media/Order/JO_7400.11C.pdf  --

"Within a 4.1-mile radius of the Nome Airport and within 3.4 miles each side of the Nome
Airport 106° bearing extending from the 4.1-mile radius to 13.2 miles east of the airport..."  'AMENDMENTS 07/07/05 70 FR 22590 (Revised) Corr: 70 FR 33349""

But when I measure on the online sectional chart http://vfrmap.com/?type=vfrc&amp;lat=64.513&amp;lon=-165.444&amp;zoom=10, using the tic marks on the lines of longitude (the lines running north and south) as a scale equal to nautical miles,  the far edge seems to measure more like 15.5 nautical miles from the middle of the airport symbol (as shown by the little blue square) -- now why would that be?  That's about 20% further -- about 2.3 miles different -- not insignificant.   

What is going on here?

Is the scale wrong, or is the dashed magenta line shown in the wrong place, or is the airport shown in the wrong place?

I assume "east" in the above usage means "generally east, measuring along the 106-degree radial".

It's not a one-time thing, I'm getting a similar discrepancy with some other similar measurements of other similar regions of Class-E-to-surface airspace, always biased in the same direction.
All the clues were there; another member figured it out (see comments).  My computer screen was stretching out the image in the left-right sense, so when I took my nautical miles scale off the tick marks on the north-south line of longitude, and then made an east-west measurement, the measurement ran significantly high.  The question noted I had seen this elsewhere and the fact that that was also on an east-west measurement, but at much lower latitude than Alaska (neither of which were noted in the question), should have been a clue to me as to what was going on.  Nothing to do with high latitudes and nothing to do with errors in the way the airspace or the map grid were charted.    

I looked at the same url on a different computer screen and the measurement came out fine.