In short: due to mishandling at the Port of Tampa Bay, some gasoline has been contaminated with diesel, and this gas was distributed to various gas stations -- mainly along the Gulf Coast of Florida (particularly unfortunate due to Idalia) but also elsewhere.

Story: https://www.tampabay.com/hurricane/2023/08/27/florida-gas-contamination-idalia/

updated list: https://www.tampabay.com/news/florida/2023/08/29/citgo-fuel-contamination-list-gas-stations-updated/ (linked above)