HDR Time Lapse Moon- Day to Night Images

Hello

I watched nuermous vidoes on how to shoot a time lapse of the moon. the option I felt was best was day to night images and them merge to HDR for each shot.

I took 400 images - day to nigh and 400 of teh night with the moon rising.

The first 100 of the moon were a little over exposed so for teh next 300 I changed the shutter speed down to 1/5 sec. 

working in LIghtroom merging the images so the first 100 merging dy to night in HDR have worked gret the mon looks good and the lighting I perfect. However noe the next 300 the moon is not showing when they merges as HDR, the moon is removed. Does anyone know why? 

I tried adjusting teh histogram and exposure and also added and extra images of the moon at the same exposure and it still does not work. 

I used interval shooting to creat the timelapse

Thanks