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If all of them show a half-blink, and if all are the same model also, then some are definitely showing a different sign from the rest.
Do they have batteries in them also? if so, there may be a problem with the battery in them... its terminals may need cleaning, or it could be the battery is weaker than it should be.
If they aren't chirping though, and/or if the ones that half-blink green are a different or slightly different model, I would say they are doing fine.
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