Unfortunately, that is exactly how /follow is implemented in WoW. It does not first check if "Malglock" exactly matches, it just scans for the first thing in some list that matches the substring "Malglock" and follows it.
If you use ISBoxer, the ISBoxer Addon implements a fix as long as you're in the same party or raid (this is what Wubsie is referring to), where it checks for an exact match and then converts to the appropriate party1, party2, party3, party4, etc or raid1, raid2 and so on instead of /follow "Malglock".
Either way, consider renaming your main toon.
There are many posts about this exact issue over the years here.![]()
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