This is not "tanking". It moves from positive to neutral negative. If the negative values reflected the positive, I'd say yes...it's not.
On that note, I've seen Twitter accounts create composites based on a -EPO to push their agenda. At the same time they have a +PNA in there. Let's be realistic instead of hype.
When looking at operational tellies, remember my rule...
"Forecast high, verification low. Forecast low, verification high."