Incompatibility, incongruity (13)
I believe the answer is:
inconsistency
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">incompatibility</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that incompatibility can be written as inconsistency)</span><br/ ><br/ >'<span class="explanation-format__original">incongruity</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for inconsistency that I've seen before include "Discrepancy" , "Variability (of opinion, performance)" , "Disparity" , "Inherent self-contradiction" .)