My phone showing calls from another phone on my account.

Yes they have. And when features like iMessage came out, they freaked out. Then Continuity and hand off were added, and they freaked out again.

If your foot hurts when you hit it with a hammer, the stop hitting it with a hammer. This is not rocket science. I can't believe the idiocy of people who continue to complain when it's doing exactly what it was designed to do. YOU are the one who refuses to accept reality. STOP SHARING an ID for iCloud and the "problem" is solved. Why is that so difficult for you to grasp?

Stop sharing an iCloud account with multiple users.

That's right. It wouldn't work. You should be using Find my friends if you want to locate someone else, not setting up their phone with your iCloud account for Find my iPhone.

iCloud accounts are NOT meant to be shared. It is behaving exactly the way it should when the same account is used on multiple devices.

If you have it set up so that you can use Find my iPhone from a single Apple ID to locate any of them then you ARE sharing an iCloud account. Don't do that.

Find my iPhone is meant to be used by one person. Not necessarily on a single device. Setting up the Find my iPhone service on another device does not in any way facilitate being able to locate your phone from that other device. You must authenticate using the account set up on the target device from within the Find my iPhone app (or from within a web browser on a computer). It does not reference the account set up on the device you're using to do the locating. Setting up the same iCloud account with Find my iPhone on multiple devices doesn't buy you anything at all except to confuse things by cross contamination of data, as you're experiencing now. Syncing call logs, etc. is an enhancement related to the Continuity features of iOS 8.

There's some confusion here. Find my iPhone is an intrinsic function of iOS. It does not require an app. The app is used to find an iOS device that is not the one it is installed on. In fact, you don't have to install the app at all. You can track an iPhone by logging in to https://icloud.com/find from any computer using the Apple ID that the phone is linked to. The app, if you have it, can also be used by logging in to the app using the Apple ID of the lost phone; it does not have to be the same as the Apple ID of the phone it is installed on.

As to your other problem:

This is a feature called "continuity." You can answer either phone from the other. If you don't want it go to Settings/FaceTime on each phone, turn it on if it is off, then turn off iPhone Cellular Calls. You can then leave FaceTime on or turn it off, as you desire.

For iMessages, you will have to go into Settings/Messages on each device and choose a different contact ID and sender ID.

This will work if you share an Apple ID, but it is better to get different Apple IDs, and group them using Family Sharing: Family Sharing - Apple Support which also supports Find my iPhone for all of the devices under the sharing plan.

Susanfog,

A new feature was added on the last update. Simply go to settings - general - handoff and suggestions - turn off. You must do this on all the devices linked to your id. Like you, I have 3 devices linked to the same appleid for Find My IPhone purposes and had no problem until this feature was added. thus will fix the issue unlike previous responses about linking ids.

This is all about iCloud, you must have it set up so you share everything with the people on your plan. Change your settings to stop that.

Susanfog,

I use and share one ID as you do... I've done it for years. I also have about 10 devices with the same ID. It works for me.

I noticed the same thing with my iPhone yesterday, reflecting other device's recent call list within my Account. Let me know if the Handoff feature fixed your issue. I wonder if this occurred because the other device has the Handoff feature ON.