very large values in bias correction file

### Brief summary of bug
Very large values in bias correction file.

### General bug information
In testing the nuopc cmeps/cdeps bias correction compset - I am seeing the following large values in the bias correction file
/glade/p/cesmdata/cseg/inputdata/atm/datm7/clm_output/cruncep_precip_1deg/gpcp_1deg_bias_correction/bias_correction.Prec.2000.nc. Is this to be expected.

```
$ ncdump -ff -v BC_PREC /glade/p/cesmdata/cseg/inputdata/atm/datm7/clm_output/cruncep_precip_1deg/gpcp_1deg_bias_correction/bias_correction.Prec.2000.nc | grep -v 0, | grep e\+
    1.347598e+14,   // BC_PREC(204,124,3)
    5.916577e+14,   // BC_PREC(204,125,3)
    2.547022e+13,   // BC_PREC(96,64,5)
    7.637063e+13,   // BC_PREC(96,65,5)
    4.458091e+13,   // BC_PREC(96,62,6)
    5.322113e+13,   // BC_PREC(96,63,6)
    4.535007e+15,   // BC_PREC(24,81,6)
    1.51875e+15,   // BC_PREC(24,82,6)
    1.523223e+15,   // BC_PREC(24,83,6)
    3.946236e+13,   // BC_PREC(96,71,7)
    7.028679e+13,   // BC_PREC(96,72,7)
    7.000657e+14,   // BC_PREC(24,77,7)
    3.654295e+14,   // BC_PREC(24,78,7)
    2.51628e+15,   // BC_PREC(24,73,8)
    4.9347e+14,   // BC_PREC(24,74,8)
    3.130425e+16,   // BC_PREC(24,75,8)
    2.447011e+13,   // BC_PREC(204,142,8)
    1.176623e+14,   // BC_PREC(198,143,8)
    1.969341e+13,   // BC_PREC(204,143,8)
    4.993199e+13,   // BC_PREC(198,144,8)
    6.292274e+13,   // BC_PREC(198,145,8)
    6.604107e+13,   // BC_PREC(198,146,8)
    2.288727e+13,   // BC_PREC(96,66,9)
    2.742293e+13,   // BC_PREC(96,67,9)
    1.215204e+14,   // BC_PREC(96,68,9)
    8.807233e+13,   // BC_PREC(96,64,10)
    3.590253e+16,   // BC_PREC(24,105,11)
    1.530637e+15,   // BC_PREC(24,107,11)
    1.650805e+14,   // BC_PREC(204,122,12)
    1.623885e+14,   // BC_PREC(204,125,12)
    2.443766e+15,   // BC_PREC(204,126,12)
```

**CTSM version you are using:** ctsm5.1.dev038

**Does this bug cause significantly incorrect results in the model's science?**
Yes - if this is a problem with the data and this would only appear in a configuration with datm using the bias correction data.

**Configurations affected:
SMS_Ld1_P48x1_Vnuopc.f19_f19_mg17.I2000Clm50BgcCru.cheyenne_intel.clm-af_bias_v7
SMS_Ld1_P48x1_Vmct.f19_f19_mg17.I2000Clm50BgcCru.cheyenne_intel.clm-af_bias_v7.validate/

### Details of bug

In addition to the appearance of these large values - the nuopc configuration the datm appears to be doing the interpolation for stream->model correctly whereas this is not the case in mct. I have overwritten the values of rainc in the coupler history file so that it only

The following file is the actual bias correction plot:


This file is the mct version of interpolation from f09->f19 (I think the problem is the fill that is occurring with mct - I don't think its doing it correctly)


This file is the cdeps version of interpolation from f09->f19 (there is still a problem on the coastlines of the fill values from f09 being mapped to the coastlines of f19 - but the rest of the plot looks reasonable)


### Important details of your setup / configuration so we can reproduce the bug
The following two compsets were run:
SMS_Ld1_P48x1_Vnuopc.f19_f19_mg17.I2000Clm50BgcCru.cheyenne_intel.clm-af_bias_v7
SMS_Ld1_P48x1_Vmct.f19_f19_mg17.I2000Clm50BgcCru.cheyenne_intel.clm-af_bias_v7.validate/

In both cases user_nl_datm was modified to include the following:
```
bias_correct = 'BC.CRUNCEP.GPCP.Precip' added to user_nl_datm
./xmlchange RUN_STARTDATE=2000-01-16
```

### Important output or errors that show the problem
Please see the plots above.