It looks like descriptions containing a comma are not supported in external selects? For example, this list
Group: grayleaf,feltleaf, dune, Scouler's & Sitka willow
Group: Sitka spruce, western & mountain hemlock
Group: white, Sitka, Lutz, western & mountain hemlock
Group: western & mountain hemlock
Group: white & Sitka spruce
Shows up as this
Group: western & mountain hemlock
Group: white & Sitka spruce
I looked at the itemset.csv generated by Connect and the descriptions are properly escaped by double quotes, so they should show up, according to the csv standard. I'm using version 1.10.43 of Connect.