Tinker Reaction Art and Tinker FD sharing reuse timer?

[Raetsel]

<p>For some strange reason my Tinker FD and two tinker reactions seem to share the same cooldown timer.</p><p><img src="http://www.fo0bar.org/misc/Tinker_Reaction_2.png" /></p><p><img src="http://www.fo0bar.org/misc/Tinker_Reaction_1.png" /></p><p><img src="http://www.fo0bar.org/misc/Tinker_FD.png" /></p><p>Strange.</p>