Blocking Volume not working?!

Any ideas why my blocking volume that’s placed on the end of a ledge to stop the player from falling off is not working?

Its a straightforward ledge:

These are the settings:

Can anyone spot anything as its incredibly annoying!

I’d really appreciate some help!

D.

I’m no pro but the problem may not be with the blocking volume but the character settings itself, also try moving the blocking volume closer and into the ledge a little bit

Which character settings?

I’ve tried moving it into the ledge makes no difference.