The mind sets are often different.
Scientists accept tentativity, changing ideas when necessary, and working toward a conclusion based on evidence.
Creationists (of the sort that deny evolution, certainly not all of them) require absolutes and often think that if one miniscule part of their TRUTH is wrong, then the whole thing comes falling down around them. They also start with the conclusion, and then search for evidence to back that up, and decide any opposing evidence is a lie, a mistake, a test, or just us being unable to understand what it "really" means.
With different mind sets, it's not a huge suprise to see the two camps talking past each other and not with each other.
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