These are not flowers, obviously, but weird enough.
Usually, the green leaves turns to red, yellow or brown in autumn when they lose chlorophyll. That would mean that the red, yellow or brown are the "true" color of the basic structure of the leaves.
This species grows red leaves around in this time of the year (late spring) which will turn to green later. So, the leaves start to grow without chlorophyll which is poured into the leaves (or created in the leaves) later.
Isn't it really weird? Could someone identify the species? (I think the climbers are parasites.)