It's one of those that Spine tries to plot and fails because of the complexity of the Notam, i.e. not a straightforward list of points defining an area. I think I say somewhere in the Help that things like this can occur. This is where a human needs to look at the plot and since it is obviously sufficiently weird to be incorrect, needs a quick click on the Don't Plot button.
As a refinement, I think I need to add a further manual choice (for a future release): "Plot as Q-line circle" which is what some other Notam programs always do anyway, without attempting to analyze the coordinates in the text. I did add some code in an attempt to filter out garbage plots and replace them with the Q-line circle by doing some extra checks on the text - this one just doesn't get picked up by those checks.
There is always going to be the odd case like this if there is any attempt to plot a meaningful area - look at H3313/08 on the same plot for an example where this works well, and where a simple Q-line circle wouldn't tell you very much at all.
PS: in this case (H3299/08), the coordinates are describing the legs of a flight, rather than points enclosing an area, and this is what is confusing Spine.