Why do I see MAP in POOL SWIMMING activity? (image inside)

Hi fellow garmin users,

quick question that I couldn't find an answer to in any other place: why do I see a map in my "pool swim" activity?

the pool is indoors and the position on the map is totally wrong (it's actually closer to where I ran the day before).

any thoughts? (firmware still 8.40 if it matters...)

thank you!

!