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Answered by
stoutZero
Jan 22, 2026
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stoutZero
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The solution is in iTerm2's settings, specifically:
Settings > Profiles > Default > Text > Ambiguous characters are double-width
I somehow had it enabled, after disabling btop looks fine, as pictured:
Because some characters are double-width, everything in btop move up every tick.
Eventually, either nothing was shown, or just the lines in the edge being shown in a double-width thicc boy version.
As I understand it, "Ambiguous characters are double-width" are for CJK / non-latin characters,
so maybe this is something that people want to figure out for non-latin character users?
Anyway, hopefully this helps someone else out there.
I spent more than a year not using btop on iTerm2, instead …