When hovering over your total amount of currency, a tooltip is shown that says 0 copper regardless of the amount of currency you have.

It seems unnecessary though for Classic since the only currency you'd care about would be your gold/silver/copper as far as I'm aware?

Just installed it and not having this issue.

Currently using version 8.2.13 (and did a fresh install as well) and currently still having this issue. I've been using Bagnon since roughly the start of Classic, so have iterated/upgraded versions. At one point in the past I was also using ArkInventory which had BagBrother as well, but has since been removed / ripped / replaced in favor of Bagnon, but FWIW thought I'd mention it.