Blynk set property is not working

I have a button which sends 0 and 1 for off and on,

and i want another button to change its property on label or off label .

but it is not working, also there is problem in button set property which shows on label twice.

How can i solve this one?

Do you mean that you want a node that will change a message containing payload number 1 or 0 to "on" or "off"? If so you want a Change node configured to set the payload to JSONata
`payload ? "on" : "off"
image

[{"id":"722f61cc.154d08","type":"change","z":"514a90a5.c7bae8","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"payload ? \"on\" : \"off\"","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":307,"y":361,"wires":[["7cbc5675.dc2ec"]]},{"id":"427779da.cb74e","type":"inject","z":"514a90a5.c7bae8","name":"","topic":"","payload":"1","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":124,"y":339,"wires":[["722f61cc.154d08"]]},{"id":"b49cb978.c4f46","type":"inject","z":"514a90a5.c7bae8","name":"","topic":"","payload":"0","payloadType":"num","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":122,"y":389,"wires":[["722f61cc.154d08"]]},{"id":"7cbc5675.dc2ec","type":"debug","z":"514a90a5.c7bae8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":507,"y":361,"wires":[]}]

no it is on blynk side where if i switch button from 0 to 1 the property of other button get also changed.

Sorry, don't understand. Is this a Blynk question or a node-red question?