Can't use two external drives with time machine

I have 2 external drives.  I tell time machine that I have 2 and it asks if I want to use both.  I say yes and it says it will alternate between them.  However, after backing up to both, it then will invariably say that one doesn't have enough room for backup...as if it is trying a new backup......  rather than just adding changed files.  Why is it doing this and how do I remedy?

It then will invariably say that one doesn't have enough room for backup
Unfortunately, these kinds of things are common with Mavericks. All that you can do is erase the drive and start over again with a new backup. Or, if you do not want to erase the drive, set it aside in a safe place and add a new drive....and Mavericks will make a full backup to that one to start things off.

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