Indenting

I created a 'scratch notes file' of VIM commands on gvim on my home pc's Fedora desktop environment.
When I port this file to my workplace's UNIX environment and launch the notes from VIM, my tab spacing is thrown off. For example, at home my text looks like this:

command1 <- comment blah blah blah
cmd2 <- comment blah blah blah
comnd3 <- comment blah blah blah

at work, I get a near similar output when I open the file through VIM. When I open through gvim, I get something like this:

command1 <- comment blah blah blah
cmd2 <- comment blah blah blah
comnd3 <- comment blah blah blah

Can you assist please?

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