Sam,
The same thing happened to me. I let the dealer who I bought my BX2350from perform the first service, as I had some recall issues (broken operator's deck.)
Anyway, when I did the next service, I noticed that the oil filter that I was given by another dealer was much smaller than what was on it. From what I could tell, the original dealer used a filter that's listed as "compatible", but it pushed the hose into the belt.
If you get the smaller one (supposedly the one that it's meant for), the hose stays well clear of the belt. At least that's what happened to my BX2350.
Jesse