Average speed doesn't match and RPM rate is not consistent.

After my Fulgaz ride the average speed on the last moment of te tour on the bike doesn’t match with the resume fit file overview. Both pictures enclosed: 29,6 versus 28,4.

Also during the ride the rpm on the bike computer is not consistent. Although I’m rotating with about 90 rpm constantly the rpm on the bike computer display fluctuates from about 70 to 90, specially at high speed (downhill),

also visible in the enclosed picture. Regards Leon.