Can anyone tell me what is going on with these knots? Deck is newer

[rwhat 14]

These knot holes have just started to do this. No idea what it is. SAP? Moisture? Any ideas?

[James 624]

Looks like some type of dry rot or bug problem.

[rwhat 14]

Thanks. Armstrong was used. Do you think that this is contractor problem? I dont think it is, but haven't ran across this problem before. Thanks again for your input!

[James 624]

No contractor problem.