You seem to be taking that out of context.
I called it “weird” as in it doesn’t look like the usual practise. I’m aware that relics are put into an altar, but I still do say it seems weird that they keep it on an altar. Like I said, relics aren’t supposed to be exposed when the Blessed Sacrament is exposed; it looks like a deviation from that rule when relics are exposed on an altar when Mass is going on. Aside from that, I’m not even sure relics are supposed to ever be placed on an altar, but rather that they are supposed to be placed on another table.
And again, as everything precious in the church is locked away, it seemed weird they’d just keep relics out like that because those items tend to attract theft. Father David clarified those issues for me in that the relics are later removed, but you can’t blame me for thinking it’s weird since even the holy oils are locked away.
Lastly, it seems weird to keep relics on top of an altar seeing as how there are already supposed to be relics inside. I haven’t ever read anything about relics being placed on top of altars, only within.
I also don’t think it’s a centuries-old custom to keep relics on the altar. It certainly is a custom to have them encased inside, or over the altar in cases of major relics, but outside of the instance I mentioned in my first post, I haven’t seen them placed on top. Judging from the responses on this thread, neither has most everyone else, with the exception of Father David.