I would advise looking at your 2017 return where you initially added the assets. Unless you deducted their cost as an expense, you should have an amount in 'Prior Depreciation' and 'Accumulated Depreciation', not just 'Current Depreciation' in your returns from 2018 going forward.
Since we can't see your return in this forum, you may want to enlist the aid of TurboTax Live to help you with this issue.
Here's a TurboTax Community discussion of a similar issue; with a workaround.
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