If you do not have any credits to subtract or any of the additions specified in the instructions it would be expected for Line 8, which represents your prior year tax liability, to be the same as your 2018 Form 1040 line 13 total tax.
If you are seeing the same number on Line 8 of Form 2210 as you see on your Line 13 of your 2018 Form 1040, this may be correct. If you are seeing that Line 8 of 2210 is double the line 13 from your 2018 Form 1040, then it sounds like there is an entry error.
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