The QDCGTW stands for qualified dividend and capital gain tax worksheet which is found in the 1040 instructions. If you had qualifying dividends and/or capital gain transactions this worksheet must be used to calculate your tax.
The change of $18 income could and often does put you in the next tax table income level (moving to the next income increment) and could create an additional $8 of tax.
Make sure the amendment is accounting for the amount of tax withheld on your W-2s. The best way to see what's happening is to use the 1040 from your original return and compare it line by line to the 1040 in the amendment. This will allow you to zero in on what's being changed. If the 1040X shows the balance due of $8 it should be correct.
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