The top of the "|" is normal, but its bottom is short.
The "|" in "OLYMPIADE" is also a bit short, but appears to be a fainter print job as well, making it look shorter than it really is.
The "|" in "OLYMPIADE" is not as short as the "|" in "OLYMPIAD".

I have a single stamp and a bottom half of an 8 stamp miniature pane, plus two OFDCs (a single stamp and a top half miniature pane).
Both the bottom half of an 8 stamp miniature pane and the single stamp OFDC have the short "|" in "Olympiad".
My short "|" is position 6.
If others have the same short "|" in position 6, it may be a constant error for inclusion in a future Unitrade.