Hi,
I think some soreness is normal. We were told to look out for redness, swelling, any kind of discharge. My partner's tube is 'seeping' too, but not much. The nurse checked it and thought it was actually healing very nicely. She did move the plastic tab that was close to the stoma about an inch away (it was very tightly against the skin/stoma). You may not have such tab, there are many different types of feeding tubes.
Dani