Lines do not join after SVG animation

[werty37]

Browser:
Firefox 57.0.1 (64-bit) on Mac OS Sierra

Link to your SVG:
http://sendeyo.com/show/9652a12a5c

Steps to reproduce it:
When testing with vivus instant, the lines do not seem to join after the SVG animation is complete.

Here is a before and after screenshot.
Before the animation:
http://oi66.tinypic.com/2qw0etl.jpg

After the animation:
http://oi67.tinypic.com/i358a9.jpg