Stuff happens on any given lap. If it happened on several laps in a row, then we have something to complain about. A sample size of one might as well be zero, they are basically statistically the same.
And I am sure NHRA would be the first to try to fix it if there was an issue (which we have seen by all of the other laps today, there is NOT an issue). It's not like they want them going down the track with inaccurate numbers.