Eve Effect
From Kerbal Space Program Wiki
The Eve Effect is a phenomenon that affects craft entering the atmosphere of Eve too steeply. This is caused by the craft entering the atmosphere too fast for drag. This causes the craft to now slow down enough before inevitablely crashing or melting .
Avoid the Eve Effect
You can avoid the Eve Effect by aerobraking at about 50km, Repeat this gradually to enter the atmosphere at a safe speed.