Yes, if you have other traditional IRA amounts in addition to the amounts that are being converted using the back door Roth strategy, your Roth conversion will not be entirely tax free.
The IRS pools all of your IRA accounts into one figure and uses a pro-rata rule to determine how much can be converted tax free.
For example, if you have $20000 in a traditional IRA, with $5000 being non-deductible, and you are converting $5000 this year using the back door Roth strategy, 25% will be tax free.
$5000 / $20000 (total IRA amount) = .25 or 25%.
Your financial institution did not lie to you unless they guaranteed it would be 100% tax free regardless of other IRA accounts you may have.
As far as the future, the backdoor Roth loophole may be closed soon. Legislation has passed the House, but not the Senate to do that.
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