Short answer: it’s normal.
Web browsers are made by different vendors (such as Mozilla and Google). And different web browsers use different rendering engines to display web pages. A site (any site, not just Breezi sites), is rendered slightly differently in each browser and/or computer.
However, there should not be any major differences or inconsistencies. If there are significant changes or issues in specific browsers or operative systems, please email us at email@example.com.