Simpler cases also show hash values

I can't figure out what's triggering the problem I'm seeing with Marksmarty as my input format, but here are test cases I've tried:

Buggy Cases

The following input doesn't work correctly.

 * __dá__

outputs

b3e0148760d915728ae480118e815bf7

The following inputs cause blank output:

 * __á__

 * dá

 * _dá_

Correct Cases

The following inputs all work as you would expect:

__á__

a

 * __á__

dá

dá

 * dá

dá

 * __á__