Why does my dropdown necesitate a second click before it displays the list? Why doesn't it show after the first click on the dropdown arrow?

I was having this same issue.  I'd click on the drop down menu.  It would open, but then immediately close itself out and upon clicking it the second time would display the contents of the drop down menu and allow you to select one as normal. 

I was able to make this stop occuring by uninstalling Adobe Acrobat from the control panel.  I then restarted my PC, and reinstalled Acrobat from the Create Cloud app.  Now when I click the drop down menu it behaves as it should.

If you're having this issue the solution is to uninstall Arobat, restart your PC & reinstall Acrobat!

So while this is STILL driving me nuts, I sent my blank form to my husband where (of course) it opens like a dream on his laptop without ANY issues with the dropdown double click thing.

This is a form I created myself in Livecycle designer (which of course is no longer supported - thanks Adobe) and while I could fork out for a new version of Adobe A: I don't why I should and B: there's no guarantee it won't be exactly the same.

I did find mention on another link someone say something about a button you tick to make sue stuff happens on first click but I can't find that anywhere on acrobat or livecycle, so I am full circle and no further forward. But I fear this started when I tried to update Acrobat

I know this is an old thread, but was there ever a solution? I am experiencing the same issue and I cannot for the life of me figure out how to fix the 'glitch' that requires you to double click before a drop down list will display properly.

I click the dropdown arrow for the field and it briefly appears (a little larger than the actual dropdown list should be) and then quickly disappears. When I click it a second time it opens properly. 

It's not preventing me from completing any forms - but it is very annoying.

Using Adobe Acrobat DC to create and use the forms, if that matters.

I'm actually getting this same problem at work using Acrobat X and then opening in Adobe Reader. The first click shows a bigger "bubbly" widget (sort of like it's using the OS widget interface). The second click puts it back to "normal" and lets you select an option. Very annoying and I can't figure out how to get rid of it.

This isn't normal, so it would be helpful if you could post a sample form somewhere so we can test it out and see what the problem is.