In 2017 the count is a little different in as such it works. In version 2018, the count missed several items. When I exported to csv the missing items were not in the subject area of the export port and I had to go back to the markup list and manually write them in.
I don't remember if the missing were even listed in the markup list. I did tons of ductile pipe and fittings that were not exported. I went back and manually counted the markups. Scary to have that happen on maybe 17,000 lbs of large bore ductile.
Apparently this issue is not yet in the fix list of revisions for 2018.5. I downgraded back to 2017 in a matter of days. Time consuming to be going back and highlighting pipe footage and then fittings to see if the count is correct.
Be careful and good luck.