Plot type=heat y-axis order

[technoautotroph]

I've been trying to work from the following example to generate a heat plot:

http://rcompanion.org/handbook/E_03.html

However, my y-axis will not order no matter how I input the data.

Example:
>Result

Item      1      2      3
P1       4.0   2.1     3.2
P2       4.1   6.1     3.4
P3       1.9   2.5     3.9
...
P12      3.9   4.5     6.7

The heat plot y-axis for P1-P12 goes in the following order: P1, P10, P11, P12, P2, P3, P4, P5, P6, P7, P8, P9

How do I get this to arrange in the proper order? I tried the following:

plot(Result,
      order=c("P1", "P2", "P3", "P4", "P5", "P6", "P7", "P8", "P9", "P10", "P11", "P12"), 
      type="heat",
      low.color = "white", 
      high.color = "blue",
      text.color = "black", 
      text.size = 4, 
      wrap = 50,
      )

Does not give me the result I am seeking.

[technoautotroph]

[technoautotroph]

The example data I provide above is dummy data, but that shouldn't matter (I don't think). Here is an actual summary of my data:

> str(Result)
List of 7
 $ results :'data.frame':	12 obs. of  11 variables:
  ..$ Item: Factor w/ 12 levels "P1","P10","P11",..: 1 5 6 7 8 9 10 11 12 2 ...
  ..$ 1   : num [1:12] 5.26 0 0 0 0 ...
  ..$ 2   : num [1:12] 0 0 0 0 0 ...
  ..$ 3   : num [1:12] 0 10.5 0 0 0 ...
  ..$ 4   : num [1:12] 0 5.26 0 10.53 0 ...
  ..$ 5   : num [1:12] 5.26 5.26 5.26 15.79 10.53 ...
  ..$ 6   : num [1:12] 10.53 5.26 10.53 5.26 5.26 ...
  ..$ 7   : num [1:12] 0 5.26 21.05 5.26 0 ...
  ..$ 8   : num [1:12] 26.3 42.1 26.3 21.1 31.6 ...
  ..$ 9   : num [1:12] 31.58 5.26 21.05 15.79 10.53 ...
  ..$ 10  : num [1:12] 21.1 21.1 15.8 26.3 42.1 ...
 $ items   :'data.frame':	19 obs. of  12 variables:
  ..$ P1 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 10 9 6 9 5 9 1 8 10 9 ...
  ..$ P2 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 10 8 4 8 8 8 5 8 10 9 ...
  ..$ P3 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 7 7 9 8 7 9 5 10 10 8 ...
  ..$ P4 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 9 10 8 10 4 9 5 5 10 8 ...
  ..$ P5 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 6 10 5 8 10 9 5 10 10 8 ...
  ..$ P6 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 8 1 6 10 5 4 1 10 10 8 ...
  ..$ P7 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: NA 10 5 9 10 3 5 7 10 8 ...
  ..$ P8 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 9 10 10 6 2 4 1 5 10 8 ...
  ..$ P9 : Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 10 10 4 5 7 9 1 5 10 9 ...
  ..$ P10: Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 9 10 7 9 10 9 1 10 10 8 ...
  ..$ P11: Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 10 10 10 10 9 9 1 8 10 8 ...
  ..$ P12: Ord.factor w/ 10 levels "1"<"2"<"3"<"4"<..: 5 6 1 7 10 9 1 7 10 8 ...
 $ grouping: NULL
 $ factors : NULL
 $ nlevels : int 10
 $ levels  : chr [1:10] "1" "2" "3" "4" ...
 $ Item    : Ord.factor w/ 12 levels "P1"<"P2"<"P3"<..: 
 - attr(*, "class")= chr "likert"