In the algorithm-driven gig economy, it’s sometimes hard for workers to know how much they’re actually getting paid. But it was especially shocking for Tom, a driver, to learn that a 69-minute grocery-delivery run for Instacart paid him just 80 cents. The customer’s $10 tip, while appreciated by Tom, who would like to remain anonymous, led to even more confusion–backing up claims from drivers and labor organizers that Instacart is lowering the money it pays out when customers tip more.

Instacart strongly denies these claims, but it admits that it goofed with Tom’s fee, known as a batch payment. “Despite the infrequency of these instances on the millions of orders that we fulfill, it’s one too many,” Instacart’s combo CFO & COO Ravi Gupta told Fast Company. “And so because of this, over the coming days, we’re going to roll out a batch minimum, which would be a minimum that will come from Instacart on every single batch of $3.”

Gupta calls Tom’s situation an “edge case” that occurs one out of 100,000 times; but once was enough to cause plenty of headache for the San Francisco-based company. Tom shared his story with labor advocacy organization Working Washington, which is already in the midst of a worker and customer campaign pushing Instacart to raise its direct payments to workers (irrespective of the customer tip amount).

A January 27 blog post on the organization’s site titled, “Earn eighty cents an hour by delivering groceries with Instacart!” quickly went viral, lighting up heated online discussions on sites like Hacker News.

Working Washington is not impressed by Instacart’s new policy. “While paying someone $3 for a job is certainly better than paying someone eighty cents for a job, I don’t think that is what people have been asking for,” says communications director Sage Wilson. “We should at the very least be talking about the neighborhood of the minimum wage and not the neighborhood of $3.”

As contract workers, Instacart drivers aren’t covered by laws enforcing a minimum wage, which is $12 per hour in Washington State. While not acknowledging a legal obligation, Instacart says that it typically pays above minimum wage, with drivers averaging over $15 per hour nationally.

Related: New documents challenge Instacart’s claim that workers get 100% of tips