Hey, I'm running coinatmradar.com bitcoin ATM map.

Can you find this machine on the map and check what the fees are listed now? I think for many BitAccess machines the fees are available

If you don't want to share the machine publicly - send me a pm, I will try to help you and contact operator as well to find out details and try to solve it for you.

I think in your case it was a very simple situation, when owner of the location didn't have the latest updated info, also operator can change fees remotely at any time, so it could be 1% one day and then it could be changed.
However, I think 20% is something strange for the sell bitcoin fee, usually it is lower than buy fee (average sell fee is at 5% now, you can check it on stats page on my site). Maybe in this particular case the operator was low on cash and that's why raised the rate.

Also BitAccess machine UI has sell price displayed during the process - you can see it here in the right upper corner during sell process: https://www.youtube.com/watch?v=yoaviCX4Urw, so I think whoever used the machine was not careful enough to look for details of operation.