I have been using my Badger 150 for about 15 years, I like it so much I got a 100 as well. I just had this same problem right now. I had sprayed last night and only gave it a quick flush out, but clearly not enough. A proper clean of the head sorted it out. But, if its a new tip, then I can only think its the needle.
The only problems I ever have with mine are self inflicted, either not properly cleaned because I was rushing or the paint has bits in it.
I am a Norfolk man and i glory in being so
On the bench: Airfix 1/72nd Harrier GR.3/Fujimi 1/72nd Ju 87D-3