What is causing my siding to melt?

[Mindy Jensen]

We are considering a new house to live-in flip. The brand new siding (installed June/July 2019) is melting above the front door. Located in Colorado, and it's been hot the last few weeks.

There is no window next to the siding, just a roof. I'm wondering if there is inadequate ventilation in that roof? 

Seller has a warranty, so they're having it repaired, but I'm concerned about next year.

@Jim K. I know you're a DIY guy.