The title implies that climate change is happening (not denialism), and that this record heat can't be explained by our current understanding of climate change.
The fact that significant change is occurring due to human causes does not mean that all change can or must be explained this way.
If current models do not explain this, it either means:
1) Current models are wrong (possible)
2) Something unrelated to our traditional notion of human-caused climate is happening (also possible)