I wroter those times onto the back of my hand and then entered them into a text.
Either:
misread the result board
misread my own writing
typo into the phone
results were updated/corrected after I had left.
Norman noted the time as a 1:53:20 as well (see Lynne's thread).
The published result is 1:53:50, it may be worth asking if the timekeeper's sheets could be checked.
Either way, a superb result.