This is the Republican Primary, very unlikely to find cheating. They are counting Provisional Ballots. Lawyers are having arguments about how to call spoiled or unallowable ballots.
1. It was cast by someone whose eligibility to vote may not have been clearly determined on the day of the election (in a closed primary like the one in Kansas, this may also include voters whose Republican Party registration was in question).
2. It was cast by someone who voted at the wrong location and may have not been listed among the registered voters in his or her precinct.
The second one is the source of a lot of misunderstanding in voter canvassing. In presidential elections, the vast majority of provisional ballots end up being cast for the Democrat candidate. This is for two simple reasons: (1) Democrat voters aren't quite as bright as Republicans, and therefore more likely to have problems with their voter registration; and (2) voting in the incorrect precinct is far more likely to occur in urban areas where voting locations could be several blocks apart, unlike rural areas where they may be miles apart. Urban voters are overwhelmingly Democrats.