If regulars always tip well in cash but don't always tip the same amount, is that "interpreted?"

What the title says. The exact cash I carry changes, and sometimes I might be saving small or large bills, and sometimes I might feel like tipping more, so the tip percentage varies. Is it right to assume that as long as the tip is good the server won't think much of it, or is there a chance they'll think their behavior is affecting it somehow, even if nothing else would suggest that?