First, if you haven't, they did request that bugs be reported via support ticket. https://symless.com/synergy/contact-support?topic=Synergy+3+Alpha
Second, I reported this bug (or at least related) to them on 10/14 and have yet to hear anything. Further, v3.0.63.0 has now come out and the bug is still present.
Finally, at least in my case, position and name do not seem to be relevant. I only have two machines. It'll never lock the mouse to the host computer, and will lock it to the client. It doesn't matter which is the host.