The reasons are as follows:

1. Brand evolution: The brand's trademark logo may gradually evolve in different time periods or stages of development. The company may have used a trademark logo in the early days, and later adopted a new trademark logo as it developed and adjusted its brand positioning. However, in order to retain the continuity and recognition of the brand, the old trademark logo is still retained and used.

2. Regional differences: In order to adapt to different markets and consumer needs, some companies may use different trademarks in different regions. This may be because different regions have different cultural, aesthetic preferences or legal and regulatory requirements, so companies choose to use multiple trademarks in order to have better adaptability in various markets.