Problem rendering individual clips

Trying to render out 12 clips in the deliver page of Resolve 17.1.1 on windows 10 and it's not working properly.
Each time I try to render I end up with only 7 clips. When I watch what's going on in the windows explorer folder it appears to be writing over certain clips. Tried different codecs and also tried putting space between each clip with same results. Any ideas?
Thank you, Marc
Each time I try to render I end up with only 7 clips. When I watch what's going on in the windows explorer folder it appears to be writing over certain clips. Tried different codecs and also tried putting space between each clip with same results. Any ideas?
Thank you, Marc