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が、確かあの

but, if I remember correctly, that…

→ が
phrase Rare #44,444
but, if I remember correctly, that… This phrase introduces a recollection or tentative identification; あの is followed by a noun.
JA: 彼には会ったが、確かあの駅でだった。
EN: I did meet him, but I think it was at that station.

確かにおいしいが、確かあの店だ。

It’s definitely delicious, but if I remember correctly, that’s the restaurant.

確かに見たが、確かあの場所だ。

I definitely saw it, but I’m pretty sure it was that place.

確かに会ったが、確かあの人だ。

I did meet them, but I’m pretty sure that was the person.

確かにそうだが、確かあの日だった。

That's certainly true, but I believe it was that day.