That is because:
-US 24 and I-474 at exit 6 differ by the last three decimal places in the latitude
-I-74 and IL 29 use one data point for exit 95A while US 24, US 150, and IL 116 use a slightly different one
-I-74 and IL 29 have different data points for exit 93. (One is closer to Adams Street while the other splits the difference between Adams and Jefferson.)
Naturally, I have no clue why those are, but I will make the necessary fixes.
(I merged the topics because "Peoria area concurrency issues" go together.)