Explanation for swim lap paces not matching lap times?


Lap 5 took me 1:00.9 and resulted in a pace of 2:02/100m which sounds correct (2x 1:00.9) but lap 6 took me 0:53.6 and the pace is shown as 3:52 while it should be 1:47?

Between lap 5 and 6 I used pause (start/stop button) for a toilet break, but it seems to correctly measured the time so I do not understand. Otherwise I have auto-rest on which also worked fine for the rest.

Can anyone explain why it does that or how I can correct it?