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Hi Adam

The symptoms you are experiencing are normal with your iDR48. The bounce you are seing in the DC change when activating phantom power, it should settle after a few seconds.
The single bounce you see on the pad should also settle with time and should only be seen if phantom power has just been activated.
The click that you hear from the mixrack when you press the pad switch is a relay in the mixer switching over to a different gain stage.

All of these symptoms are normal for the system and should not cause any problem if normal practice is carried out when using the mixer.

E.g. Mute the channel before changing phantom power & PAD settings

Hope this helps

Sam A&H