Just because a company installs James Hardie siding doesn’t mean they do it correctly.
There are specific rules to follow; the right way is the only option.
Installing and replacing siding is an investment, so you must hire people who know what they are doing and who are certified James Hardie Elite Preferred Contractors.
https://www.elitehomeexteriorsnw.com/blog/james-hardie-common-installation-errors/