Sally Beauty Holdings revealed on Monday the company is investigating instances of "unusual activity involving payment cards" at some of its stores over the last week.

In a statement released by the company on Monday, executives for the Texas-based retailer added all of their attention is now focused on making certain "our customers are protected." The new troubles come just a year after the Wall Street Journal reported a similar breach affected more than 25,000 of the store's customers in 2014.

Monday's statement continued, "Until this investigation is completed, it is difficult to determine with certainty the scope or nature of any potential incident."

Back in March of last year, Sally execs admitted the accounts of some 25,000 customers had been compromised. The company has now been mandated to upgrade all of its store checkout terminals to accept computer chip-embedded credit cards by October of this year.

With nearly 5,000 stores, Sally Beauty distributes beauty products in more than a dozen countries. The company grossed nearly $4 billion in annual revenue and $246 million in net earnings during fiscal year 2014. The retailer distributes everything from hair, skin and nail care products throughout the U.S., the United Kingdom, Belgium, Chile, France, the Netherlands, Canada, Puerto Rico, Mexico, Ireland, Spain and Germany.

At one point, Sally stock fell by 1.15 percent on Monday to $30.92 per share, as company execs insisted they could not reveal further information regarding the investigation.

During the 2014 incident, Biz Journals reported the franchise breach actually proved larger than what was initially announced. Even company officials later admitted as much, adding executives "would not speculate on the scope of our recent data security incident until forensic review processes because experience with such incidents at other retailers has taught that it is difficult to ascertain the extent of a data breach."