Missiles flying AWAY from targets?

[SpeedDaemon (OP)]

So I finally got my first combat fleet in range of the *spoilers* that I'm trying to kick out of a system I want to colonize.  Intelligence says the ships are capable of 10k km/s, and size (1000T) and engine signature (200) seem to confirm that, if I understand how that all works.  My missiles go ~45k km/s, but for some reason, the "Missiles in Flight" tab shows range to target and time to target increasing.

Any ideas what's going wrong?

[TheDeadlyShoe]

That tab's unreliable. Just rely on what you see on the map.

[SpeedDaemon (OP)]

Ah, thanks. . .  Good to know.

Now if only I hadn't overreacted and wasted 4 full broadsides from 4 ships, when the targets died to one WH16 missile each.