I upgraded from 3.5.4 to 3.6.2 this morning, and noticed that the first line of the end message was 'under' the banner. I only see this issue with the Bootswatch theme, which has a slightly bigger banner than the other default themes. The issue occurs with existing surveys (which displayed fine on 3.5.4) and new surveys.
I upgraded using the instructions for a minor upgrade: backed up existing installation, cleared it, copied over 3.6.2 files, restored config.php, restored uploads directory, set proper permissions.
I have worked around the problem by adding two blank rows at the top of the end message.