Seems when I have a defense debuff that can expire the merged datanode adopts the same timer, but the timer doesn't apply to the datanode.
No idea if the same thing occurs on the velox or the other permanent buffs.

Happens with buffs too it seems.

It's because the total value of that % changes with the buff and debuff, but as soon as it's over, it goes back on it's merry way.

Yeah, what Trinton said is correct; just ignore it. The same thing will happen with the Anubix effect, Velox thrusters, and any other permanent module-based boosts to Attack/Defense. Any buff or debuff will show the permanent buff as being limited, but it remains after the other buffs/debuffs wear off.

Can't post a pic but have definitely seen it happen with the Velox.

happens with planet strucures as well. Goes back to normal when the temp effect wears off.