The last two times I have selected the jungle circuit I have spawned after the junction that takes you to the jungle. As soon as I start to pedal the climb jumps immediately to 87m. But as I have just started this is wrong. How can I fix this?
Thanks for the report! We’re working to fix this now. 
This has now been fixed in the 8/2/2018 (or 2/8/2018 for North Americans) update.