From The Kof-K: Sweet Delish! Donut Bites

Delish! Donut Bites (Cookies & Cream, Powdered Sugar, Red Velvet and Birthday Cake) have been mistakenly labeled with a plain Kof-K symbol. These products contain milk and are certified Kosher dairy.
From The cRc: Royal Bee Icing Decoration (Leonardo Sweets)

Please be aware that Royal Bee Icing Decoration, under the brand name Leonardo Sweets (Ohr Yehudah, Israel) is being sold in Israel with an unauthorized cRc logo. This product, which is manufactured in China, is NOT Kosher certified by the Chicago Rabbinical Council.
From The O/U: Golden Natural Products Dried Cherry Plums

The O/U does NOT certify Golden Natural Products Dried Cherry Plums. Some packaging bears an unauthorized O/U symbol.
From The O/U: Zeimatijos Pienas Reggianito Cheese

The O/U does NOT certify Ziematijos Pienas Reggianito Cheese (made in Lithuania and sold in Mexico). Some 4.5 Kilo blocks of this cheese are being sold with an O/U letter of certification stuck onto the wrapper. The certificate does NOT list this cheese as certified, and the use of the certificate on this cheese is […]
From The O/U: Heart of Jerusalem Restaurants – Colorado and Florida

The O/U does NOT certify Heart of Jerusalem Restaurants.
From The O/U: Nutriland Soy en Trozos:

The O/U does NOT certify Nutriland Soya en Trozos, a product sold in Panama. Some packaging bears an unauthorized O/U symbol.
From The O/U: Keto Shortbread Cookie Mix

The O/U certifies Keto and Co. Shortbread Cookie Mix as an O/UD (dairy) product. Some packages of this product were labeled with a plain “O/U”, without the “D” designation. This product contains dairy as indicated in the ingredients statement.