Did you disable all addons except the two called 'ElvUI' and 'ElvUI Config'?: Yes.
Did you disable all addons to make sure it is not an issue with the WoW client itself?: Yes.
Did you check for lua errors? (/luaerror on): Yes.
If you received an error then post it below (use the 'code' bbcode):
Please explain the issue you're having with as much detail as possible. If there is a way to reproduce the issue then mention that too.:
When I click on to a different chat tab, the editbox thing you type into pops up, and I have to hit enter twice to get rid of it, it's quite annoying.
If your issue is graphical then please take some screenshots to illustrate it.