This sight is in the dovetail backwards - or bass-ackwards - your choice. I would simply, with the rifle held in rubber jaws in a vice, tap the sight out, and re-install in the correct orientation.

Too - the folding leaf should fold towards the front sight, so you pull it backwards to flip it up using the forefinger and thumb that are on each side of the forend. (usually - but there are exceptions to this 'rule' as shown above in the other picture)

I have seen sights with leaves folding both ways as well - typically BRNO and CZ .22 rifles, however their scallops always face properly - iirc.

Note too, how when the forward facing index marks are aligned or almost aligned with the marks on the sight the site is nowhere near centred. That misalignment also shows it's in the dovetail reversed.

Typically when made, the sight is centred and the 'witness' marks are applied with a chisel & hammer - by hand - one blow marking both the sight and the base. Because this was done to both fore and after surfaces of both sight and base, the marks are not perfectly centred as they would have been done by a machine. BUT - if the sight was in the dovetail properly, they marks should line up with the sight perfectly centred in the dovetail.

I hope I didn't confuse this further.