Wierd BiB/Upgrade Finder

In this snap 9406f14a8ec44771878d1e78ace823b8
i get the upgrade “Tempered Titanstel Treads” suggested, so i got them.
But then in BiB its says "Sabatons of Draconic Vigor (id: d5a6542b216b4897a95d588ef6d7ca8d)

Why tell me this is an upgrade and then in BiB its not?

If this app is making me waste Gold in game like this , I will certainly not pay the monthly fee.

When I load the first snapshot, it shows Tempered Titansteel Treads as a -0.18% downgrade in the upgrade finder, crafted items search. BiB in the second snapshot shows the same result.

Can you tell me where you saw the tempered titansteel treads shown as an upgrade?