When I swim a km in a 50m pool, the graph show the 20 columns representing each 50m lap but the vertical axis on the graph seems to be set on the 100m cycle so I am unable to read a time from the graph for each 50m lap. Shouldnt the verticle axis represent the time for each 50m lap. For instance if I swim 2 laps at 0:50 and 1:10 the vertical axis should reflect this yet it is set at 2:00 for the first column.