Could be an outlier. Until another poll shows the same thing, that is what it probably is.
See post #62:
You were lied to , or to be nicer, misled. The poll was if you combined their first and second place polling numbers they were tied. In other words If Trump had 20% first choice numbers and 3% second place numbers he would be at 23%. If Carson had 3% first place choices and 20% second place choices.. they would be tied at 23%.. Cute wasnt it?