Happened to me with Glasgow Control Zone. I was checking my GPS - right up the line- when call came from another airfield whom I was talking with to contact Glasgow App. I tried, they ignored me, however called up the sup at Glasgow on landing and was told I had infringed. Apologised immediately, he accepted, and then I became a report. I re ran the GPS unit, and my track was very close, however, I felt I was outside, they reported an infringement
It was my fault and I learnt not to go to close without speaking to the CTZ
