Bug in dynamics tendency?

[ericaligo-NOAA]

Following the instructions here: https://ccpp-techdoc.readthedocs.io/en/latest/ParamSpecificOutput.html
I was able to output and plot various physics and dynamics tendencies. I noticed that the x and y wind tendencies from the dynamics have reasonable values until the first output time after my restart. I see values such as Contouring: -555556 to -555556 interval 0.01. I have hourly output until my restart time when I have output every 3 minutes. My fhzero is set to 3 hours. All other tendencies seem okay. Is this a bug?