Just six weeks after they were released, Goose Island Beer Co. is offering refunds on some of its most popular beers.

According to a post from Jared Jankoski, brewmaster at the Chicago, Ill.-based brewery, some bottles of 2015 Bourbon County Brand Coffee Stout and Bourbon County Brand Barleywine have “developed flavors that are not consistent with our expectation of how these beers should taste.” As a result, Goose Island is offering to refund the purchase price of the beers to anyone who is not satisfied with them.

“It has come to our attention that since bottling the 2015 Bourbon County Coffee and Bourbon County Barleywine, they have developed flavors that are not consistent with our expectation of how these beers should taste,” reads the website post. “That’s not to say the beer doesn’t taste good, in fact some drinkers may enjoy it very much. However, it doesn’t meet our standards for the taste profile of these beers.”

Rumors of flavor issues with both Bourbon County Coffee and Bourbon County Barleywine have been circulating on Facebook groups and craft beer forums for weeks, but this is the first official acknowledgment from Goose Island that there is an issue. The other four beers in the Bourbon County lineup for 2015 are not thought to be affected, and Goose Island has publicly stated that while the flavor profile is off on “some bottles,” the problem bottles “tested negative for infection.”

People who believe their beer has issues can contact Goose Island by calling 1-800-Goose-Me for a refund until Feb. 29.