Dss not using all flat frames?

[Craig a]

Hello everyone, ran into a problem in dss, the other night I was imaging and at the end I fired off 35 flat frames but when I load them into dss and register it is showing it will only use 23 of the flats even though it’s showing there’s 35 loaded into the program? Any body have any idea why this is? 

[Craig a]

I should add this is the second time in as many imaging sessions this has happened and it’s still only using 23 out of the 35 I normally take