And what exactly are you doing to "join"? Select the anchor points and hit Ctrl+J? Also, what makes up your drop shape? Screenshots tell a lot...
Tried selecting anchor points and joining for an hour, tried ungrouping and everything else I found on a google search, even watched tutorials but could not get it to join. I do not know how to do a screenshot and attach it sorry!
Finally figured it out, now I feel stupid!
When everything was telling me to select anchor points, I was actually clicking on the actual anchor points instead of just selecting the general area with the selection tool.
Thanks for you help.