Yep, it's been this way forever and no way to fix it that I've seen. Makes doing any sort of fine detail analysis impossible.

In the case that brought it to my attention yesterday, a ground rig had done an extra pass of fungicide across the rows. Well you can't just select that strip since the data for that strip is up down up down up down the whole way across the strip. If they combined passes up and back. It works out ok if they went the same direction for a bunch of passes in a row. (arrow in the pic) But in places where the combine went up and back each pass it's useless. 

The picture has a strip of sand in the field. The left side looks good because the combine was doing all passes one way. The right side should look the same but doesn't because they went back and forth. 

(YieldMapIssue (full).png)

YieldMapIssue (full).png (63KB - 3 downloads)