Here are three individual nodes "barrier=bollard". None of them is on the way that seemes that should be barriered.

Please either but just one node on the way that is blocked, or put a line with barrier=bollard and make it intersect with the way.

Think of including maxwidth:physical=* if you can determine.

(This note was created just by looking at the map, not at the real physical place, so no fixing by myself.)

See https://wiki.openstreetmap.org/wiki/Tag:barrier%3Dbollard.