I believe the confusion occurred because the likelihood of confusion was completely ignored.
Making sure you are fully aware of what constitutes likelihood of confusion is just as important for your initial naming process as it is for any trademark watching you have in place. Obviously, you do not want to submit a trademark application that will be rejected. The connection between the similarity of the two brand names and the relative closeness of the goods or services is an important one. Computer software and computer peripherals, for example, are likely to attract similar customers and so the risk of confusion is higher. If the two competing products are tractor parts and bikinis, it is possible that even an identical brand name could be acceptable as it seems unlikely that their markets would be substantially made up of similar consumers.
You can read more here: https://www.trademarknow.com/blog/7-factors-for-identifying-trademark-likelihood-of-confusion
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath