Could you explain these navigation details?

When following a course during my activity some information are not why I expect (based on info I had on the F3).

Example on pictures attached:


The ETE information is not correct. I guess it's an intermediary time but what means the 2 index at the left of ETE duration ?

I've the same kind of partial time for other duration informations of my activity with index at the left of the time info.

Many thanks for your help