Sorry to be straight forward: the low resolution scanner doesn't change whatever is in your head, it might just not make it visible. So the better scanner is really the better option.
To your questions: hard to answer. It could well be a technical error, there are partial volume artifacts and a whole variety of other things in MRI, but to really judge this one would need to see the images. This could also be the case with misinterpretation. But from my understanding of what you have written, there was this small area, which is rather a description than an interpretation. Interpreting this might be challenging with what is currently available. From what you have written, it might be interesting to check whether the blood - brain - barrier is disturbed in this area (hence the question for i.v. contrast). I am sure, the neuroradiologist taking part in your medical work up will suggest the best way to further look into things.
Keep asking until you have an acceptable explanation!