could you have entered in the US$ column the amount you paid in Japanese yen? we can't see your return so this is a pure guess but obviously, you can't get more in FTC than you actually paid but if you have a FTC carryover from prior years then maybe. but unlikely.
your additional FTC from this land rental should be the net of the $3500 less the amount from form 1116 line 6 of that column divided by taxable income (1040 line 15) times the line 16 of 1040 or the FTC you paid on this whichever is less.
