This is something I have noticed on my last 2 dives but not previously so it may be a bug introduced in 2.60.
During my dive on Wednesday, throughout the dive the Mk1 said the temperature was 18[SUP]o[/SUP]C but the profile says it was 17[SUP]o[/SUP]C for the whole dive: https://connect.garmin.com/modern/activity/2807347205
Similarly on Saturday, Mk1 said 17[SUP]o[/SUP]C throughout the dive but the profile said it was 16[SUP]o[/SUP]C: https://connect.garmin.com/modern/activity/2814226452
On both dives my Perdix agrees with the temperature in the profile and displayed that temperature during the dive.