Translation:I have some problems with that program.
Perhaps "a few" but not "few", which means something else.
- I have a few problems. = I have some problems. = I have several problems.
- I have few problems. = I do not have many problems.
The first one seems like a bigger number than the second - the first emphasises that there are a significant number of problems, while the second one admits that there are problems but emphasises that the number is small and, perhaps, not very significant.
So I think kelkaj could be "a few", but "few" would be better as malmultaj.