[atlas] "funny" comment in pop-up display for a measurement? (v4/v6 addr mismatch)

Some more digging and some more confusion? Logged in, looking at "My measurements", selecting 1033944, a traceroutev6. Bringing up the Map tab, clicking on the green balloon in Bremen (Probe ID 13255) with the *2* (hops) in it, pop-up comes up. Nice! But the *-comment at the bottom puzzles me, by saying: * The last address does not match the target IP (192.153.174.196) This is sort of obvious, as the address referred to is 2001:6f8:114e:4::1 What's the background for this behaviour? Wilfried