It is less fun if the outcome is non-deterministic. It means that occasionally the win is determined randomly. That takes away a certain element of skill.
I guess if you let it run for a long time it should converge on a first move?
I don't think there's a real fix for the issue, unless someone effectively solves chess someday. Otherwise your win/loss is fundamentally based on the imperfect evaluation of a particular engine.
If it's really just the nondeterminism that bothers you (which is fair enough, preferences vary), there's engines that either are deterministic or can be made so with settings.
