I would believe it unlikely for FAT metadata to survive an ext2fs formatting, but it is possible. More likely is a configuration problem of some kind.
You haven't shown us fdisk or disklabel output, but I suspect your foreign MBR partition (fat32, or ext2fs) and your disklabel partition might not cover the exact same sectors. They should. If they don't, you'll need to manually adjust the disklabel to match.
When an OpenBSD disklabel does not exist on a drive, a virtual disklabel is created, and foreign filesystems are assigned partition letters in that virtual disklabel, starting with "i". Once a physical disklabel exists, OpenBSD will not do that for you, so changes in MBR partitions must be manually made to disklabel partitions, in order for them to be used within OpenBSD.
Once your disklabel starting sector and size is confirmed to match the correct MBR partition, you should format appropriately using newfs_msdos(8), which will create an empty FAT12, FAT16, or FAT32 partition.
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