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I was asked to add screenshots of this problem.  As I mentioned, this problem occurs in MOST places where I want to enter dollar amounts, but here, I will demonstrate it in a case of adding a Supporting Detail list.

The following screenshot shows I am about to enter the information in a 1099-INT form for some fictitious bank.

Now I right-click to add a Supporting Detail list for Box 1:

I enter "item 1" as Description and hit Return:

Now I enter 10.47 in the Amount field:

And hit the Return key:

As you see, my $10.47 entry has been changed into $1,047.00 just by hitting the Return key.  But it gets worse!  Now I enter "item 2" as description for the nest item:

and enter 20.00 for the amount:

And click on the "close" to close the Supporting Details list to get:

So, my original $10.47 amount for "item 1" was changed to $1,047.00 as we saw in earlier screenshots.  However, that (incorrect) $1,047.00 amount plus the $20.00 that I entered for "item 2" now adds up to not even (incorrect) $1,067.00 by simple rules of arithmetic, but to a total sum of $304,700.00 by the rules of Turbotax arithmetic!!!  Recall that the correct sum of the two amounts that I entered is 10.47 + 20.00 = 30.47.

Now, astonished by having received over $300,000.00 in interest from this bank, I right click again to open the same Supporting Details list.  Before anything is opened, I see the total magically increase once again:

And then the same list opens to show:

which at least does make some bizarre sense (in the sense that both my original entries of 10.47 and 20.00 have been consistently multiplied by 100, only).

But, by just hitting the Return key to skip through the list entries, the numbers in the list get multiplied by 100 once more, as you see for the case of the amount on the first line here:

And clicking on "close" to close the list, multiplies the whole (incorrect) sum by 100 one more time:

Once again, this is just an example.  This same bug shows up in MOST places where I enter a number, whether it is is a Supporting Detail list or other form entries.