No, the $25 min is still in place. I suspect that the listing only had $14 left to fund at the time when your manual bid reached their system. Just to make sure, when all was said and done, you did end up having $14 on this listing in question and not $25, right?
I would email this question to them. I have seen cases where the website, the pending investments section, and the API are out of sync. The most common case is that a listing appears as open for bidding (not fully funded) in a website search but it is in fact already filled and new bids on that listing from either the website or the API will fail. This state can persist for ~0-3mins.
I'm not aware of any preferential bid treatment for large, small, VIP, etc., investors beyond the whole loan program. I use both the API and the website and have not yet seen anything to suggest that bids are not honored on a first-come, first-served bases.