MQTT - Raspberry Pi blinking / flashing / flickering unavailable when refresh


Currently I have a few Raspberry Pi’s that I’m monitoring via MQTT. The connection is working and shows the info I require. The only downside is the Entities Card is blinking the information almost every 1 or 2 seconds. The clients have a refresh of 60 seconds.

Does anyone know why the cards are blinking?

I’m using the same card for monitoring my HA and NAS and they don’t blink.

Thanks in advance,